fix: refactor GitHub Actions workflow to define environment variables and strategy explicitly

.github/workflows/test-and-push.yml

@@ -9,13 +9,19 @@ jobs:
   test:
     runs-on: ubuntu-latest
 
-    strategy: &db-matrix
+    strategy:
       fail-fast: false
       matrix:
         include:
           - db: postgres
             variant: base
 
+    env:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: postgres
+      POSTGRES_PORT: 5432
+
     steps:
       - uses: actions/checkout@v4
       - uses: jdx/mise-action@v3
@@ -32,13 +38,27 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/v')
     runs-on: ubuntu-latest
 
-    strategy: *db-matrix
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - db: postgres
+            variant: base
 
     steps:
       - uses: actions/checkout@v4
       - uses: jdx/mise-action@v3
 
+      - name: Login to registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ secrets.REGISTRY_URL }}
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
       - name: Push
+        env:
+          REGISTRY_URL: ${{ secrets.REGISTRY_URL }}
         run: just push ${{ matrix.db }} ${{ matrix.variant }}
 
       - name: Cleanup