fix: resolve duplicate Authorization header in release workflow

Checkout with the GitHub App token directly instead of manually
setting http.extraheader after checkout. The previous approach
added a second Authorization header on top of the one persisted
by actions/checkout, causing GitHub to reject git fetches with
HTTP 400.

Signed-off-by: Gorkem Ercan <gorkem.ercan@gmail.com>

Author: gorkem

.github/workflows/platform-release.yaml

@@ -176,11 +176,21 @@ jobs:
     runs-on: ubuntu-latest
     needs: [build-linux, build-macos, build-windows]
     steps:
-      # checkout the current repository
+      - name: Generate a token for docs update PR
+        id: generate-token
+        uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859   ## v3.0.0
+        with:
+          app-id: ${{ vars.KITOPS_BOT_ID }}
+          private-key: ${{ secrets.KITOPS_BOT_PRIVATE_KEY }}
+          owner: kitops-ml
+
+      # checkout the current repository using the App token
+      # so that git credentials are set correctly for the docs update PR
       - name: Checkout kitops
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           path: kitops
+          token: ${{ steps.generate-token.outputs.token }}
 
       # Create the homebrew-file directory to store the
       # homebrew artifacts and copy the awk script and
@@ -248,22 +258,13 @@ jobs:
           fi
           gh release create "${release_args[@]}"
 
-      - name: Generate a token for docs update PR
-        id: generate-token
-        uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859   ## v3.0.0
-        with:
-          app-id: ${{ vars.KITOPS_BOT_ID }}
-          private-key: ${{ secrets.KITOPS_BOT_PRIVATE_KEY }}
-          owner: kitops-ml
-
       - name: Generate CLI documentation
         shell: bash
         env:
           GITHUB_TOKEN: ${{ steps.generate-token.outputs.token }}
           TAG_NAME: ${{ inputs.release_tag || github.ref_name}}
         run: |
           pushd kitops
-          git config --local http.https://github.com/.extraheader "AUTHORIZATION: basic $(echo -n "x-access-token:${GITHUB_TOKEN}" | base64)"
           CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
           PR_BRANCH="${{ github.ref_name }}-docs-update"
           git fetch origin main