chore(ci): point the postgres health checks at the database they create

`pg_isready -U <user>` defaults the database to the username, so every 10s probe
against a sidecar whose POSTGRES_DB is `<user>_test` logged `FATAL: database
"<user>" does not exist`. The probe still reports the server up, so this was
pure noise — but it is noise that reads like a provisioning failure in the
container log and cost a wrong hypothesis while diagnosing the red release-tag
runs. Name the real database in the probe.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: dmealing

.github/workflows/integration-tests.yml

@@ -46,7 +46,7 @@ jobs:
         ports:
           - 5432:5432
         options: >-
-          --health-cmd "pg_isready -U metaobjects"
+          --health-cmd "pg_isready -U metaobjects -d metaobjects_test"
           --health-interval 10s
           --health-timeout 5s
           --health-retries 5
@@ -130,7 +130,7 @@ jobs:
         ports:
           - 5432:5432
         options: >-
-          --health-cmd "pg_isready -U migrate"
+          --health-cmd "pg_isready -U migrate -d migrate_test"
           --health-interval 10s
           --health-timeout 5s
           --health-retries 5

.github/workflows/local-ci.yml

@@ -130,7 +130,7 @@ jobs:
         ports:
           - 5432                  # dynamic host port — no fixed-port collision
         options: >-
-          --health-cmd "pg_isready -U metaobjects"
+          --health-cmd "pg_isready -U metaobjects -d metaobjects_test"
           --health-interval 10s
           --health-timeout 5s
           --health-retries 5
@@ -172,7 +172,7 @@ jobs:
         ports:
           - 5432
         options: >-
-          --health-cmd "pg_isready -U metaobjects"
+          --health-cmd "pg_isready -U metaobjects -d metaobjects_test"
           --health-interval 10s
           --health-timeout 5s
           --health-retries 5
@@ -199,7 +199,7 @@ jobs:
         ports:
           - 5432
         options: >-
-          --health-cmd "pg_isready -U metaobjects"
+          --health-cmd "pg_isready -U metaobjects -d metaobjects_test"
           --health-interval 10s
           --health-timeout 5s
           --health-retries 5
@@ -226,7 +226,7 @@ jobs:
         ports:
           - 5432
         options: >-
-          --health-cmd "pg_isready -U metaobjects"
+          --health-cmd "pg_isready -U metaobjects -d metaobjects_test"
           --health-interval 10s
           --health-timeout 5s
           --health-retries 5