fix: add custommanager to renovate.json

[sxyql]

Fixes: #3616 and #3996

[sxyql]

Was locally tested with renovate:

         "regex": [
           {
             "deps": [
               {
                 "depName": "opentofu/opentofu",
                 "currentValue": "1.11.0",
                 "datasource": "github-tags",
                 "versioning": "semver",
                 "replaceString": "# renovate: datasource=github-tags depName=opentofu/opentofu\nENV OPENTOFU_VERSION=1.11.0",
                 "updates": [
                   {
                     "bucket": "non-major",
                     "newVersion": "v1.12.3",
                     "newValue": "1.12.3",
                     "releaseTimestamp": "2026-06-18T13:19:25.000Z",
                     "newVersionAgeInDays": 9,
                     "newMajor": 1,
                     "newMinor": 12,
                     "newPatch": 3,
                     "updateType": "minor",
                     "isBreaking": false,
                     "libYears": 0.5226549023338407,
                     "branchName": "renovate/opentofu-opentofu-1.x"
                   }
                 ],
                 "packageName": "opentofu/opentofu",
                 "warnings": [],
                 "sourceUrl": "https://github.com/opentofu/opentofu",
                 "registryUrl": "https://github.com",
                 "currentVersion": "v1.11.0",
                 "currentVersionTimestamp": "2025-12-09T18:52:00.000Z",
                 "currentVersionAgeInDays": 200,
                 "isSingleVersion": true,
                 "fixedVersion": "1.11.0"
               },
               {
                 "depName": "hashicorp/terraform",
                 "currentValue": "1.11.3",
                 "datasource": "github-releases",
                 "versioning": "semver",
                 "replaceString": "# renovate: datasource=github-releases depName=hashicorp/terraform\nENV TERRAFORM_VERSION=1.11.3",
                 "updates": [
                   {
                     "bucket": "non-major",
                     "newVersion": "v1.15.7",
                     "newValue": "1.15.7",
                     "releaseTimestamp": "2026-06-24T16:47:12.000Z",
                     "newVersionAgeInDays": 3,
                     "newMajor": 1,
                     "newMinor": 15,
                     "newPatch": 7,
                     "updateType": "minor",
                     "isBreaking": false,
                     "libYears": 1.2468502980720446,
                     "branchName": "renovate/terraform-monorepo"
                   }
                 ],
                 "packageName": "hashicorp/terraform",
                 "warnings": [],
                 "sourceUrl": "https://github.com/hashicorp/terraform",
                 "registryUrl": "https://github.com",
                 "mostRecentTimestamp": "2026-06-26T09:03:31.000Z",
                 "currentVersion": "v1.11.3",
                 "currentVersionTimestamp": "2025-03-26T14:22:41.000Z",
                 "currentVersionAgeInDays": 458,
                 "isSingleVersion": true,
                 "fixedVersion": "1.11.3"
               },
               {
                 "depName": "gruntwork-io/terragrunt",
                 "currentValue": "0.78.0",
                 "datasource": "github-releases",
                 "versioning": "semver",
                 "replaceString": "# renovate: datasource=github-releases depName=gruntwork-io/terragrunt\nENV TERRAGRUNT_VERSION=0.78.0",
                 "updates": [
                   {
                     "bucket": "non-major",
                     "newVersion": "v0.99.5",
                     "newValue": "0.99.5",
                     "releaseTimestamp": "2026-03-26T13:36:17.000Z",
                     "newVersionAgeInDays": 93,
                     "newMajor": 0,
                     "newMinor": 99,
                     "newPatch": 5,
                     "updateType": "minor",
                     "isBreaking": true,
                     "libYears": 0.8982992453069508,
                     "branchName": "renovate/gruntwork-io-terragrunt-0.x"
                   },
                   {
                     "bucket": "major",
                     "newVersion": "v1.0.8",
                     "newValue": "1.0.8",
                     "releaseTimestamp": "2026-06-10T19:50:18.000Z",
                     "newVersionAgeInDays": 17,
                     "newMajor": 1,
                     "newMinor": 0,
                     "newPatch": 8,
                     "updateType": "major",
                     "isBreaking": true,
                     "libYears": 1.1072300228310503,
                     "branchName": "renovate/gruntwork-io-terragrunt-1.x"
                   }
                 ],
                 "packageName": "gruntwork-io/terragrunt",
                 "warnings": [],
                 "sourceUrl": "https://github.com/gruntwork-io/terragrunt",
                 "registryUrl": "https://github.com",
                 "mostRecentTimestamp": "2026-06-26T14:28:21.000Z",
                 "currentVersion": "v0.78.0",
                 "currentVersionTimestamp": "2025-05-02T16:30:12.000Z",
                 "currentVersionAgeInDays": 421,
                 "isSingleVersion": true,
                 "fixedVersion": "0.78.0"
               },
               {
                 "depName": "ansible",
                 "currentValue": "13.5.0",
                 "datasource": "pypi",
                 "versioning": "semver",
                 "replaceString": "# renovate: datasource=pypi depName=ansible\nARG ANSIBLE_VERSION=13.5.0",
                 "updates": [
                   {
                     "bucket": "non-major",
                     "newVersion": "13.8.0",
                     "newValue": "13.8.0",
                     "releaseTimestamp": "2026-06-18T20:37:56.000Z",
                     "newVersionAgeInDays": 9,
                     "newMajor": 13,
                     "newMinor": 8,
                     "newPatch": 0,
                     "updateType": "minor",
                     "isBreaking": false,
                     "libYears": 0.23314697488584474,
                     "branchName": "renovate/ansible-13.x"
                   },
                   {
                     "bucket": "major",
                     "newVersion": "14.1.0",
                     "newValue": "14.1.0",
                     "releaseTimestamp": "2026-06-18T20:37:56.000Z",
                     "newVersionAgeInDays": 9,
                     "newMajor": 14,
                     "newMinor": 1,
                     "newPatch": 0,
                     "updateType": "major",
                     "isBreaking": true,
                     "libYears": 0.23314697488584474,
                     "branchName": "renovate/ansible-14.x"
                   }
                 ],
                 "packageName": "ansible",
                 "warnings": [],
                 "sourceUrl": "https://github.com/ansible-community/ansible-build-data",
                 "registryUrl": "https://pypi.org/pypi",
                 "homepage": "https://ansible.com/",
                 "mostRecentTimestamp": "2026-06-18T20:37:56.000Z",
                 "currentVersion": "13.5.0",
                 "currentVersionTimestamp": "2026-03-25T18:15:53.000Z",
                 "currentVersionAgeInDays": 94,
                 "isSingleVersion": true,
                 "fixedVersion": "13.5.0"
               }
             ],
             "matchStrings": [
               "# renovate: datasource=(?<datasource>\\S+) depName=(?<depName>\\S+)(?: versioning=(?<versioning>\\S+))?\\s+ENV\\s+\\S+=(?<currentValue>\\S+)",
               "# renovate: datasource=(?<datasource>\\S+) depName=(?<depName>\\S+)(?: versioning=(?<versioning>\\S+))?\\s+ARG\\s+\\S+=(?<currentValue>\\S+)"
             ],
             "versioningTemplate": "{{#if versioning}}{{{versioning}}}{{else}}semver{{/if}}",
             "packageFile": "Dockerfile"
           }
         ]
       }