fix: use env vars for docker registry credentials

Pass FORGEJO_REGISTRY_USER and FORGEJO_REGISTRY_TOKEN via environment variables.
Image: forgejo.riotpiao.com/rock/api-gateway (API gateway service)

.gitea/workflows/ci.yaml

@@ -5,22 +5,18 @@ on:
     branches: [main]
   pull_request:
     branches: [main]
-  workflow_dispatch:
 
 env:
   REGISTRY: forgejo.riotpiao.com
   IMAGE: forgejo.riotpiao.com/rock/api-gateway
-  DOCKER_HOST: tcp://localhost:2375
 
 jobs:
-  ci:
+  test:
-    name: CI
+    name: Test
     runs-on: golang
     steps:
-      - name: Install Node.js and Docker
+      - name: Install Node.js for actions runtime
-        run: |
+        run: apt-get update && apt-get install -y nodejs
-          apt-get update
-          apt-get install -y nodejs docker.io
 
       - name: Checkout code
         uses: actions/checkout@v4
@@ -31,9 +27,25 @@ jobs:
       - name: Go test
         run: go test ./...
 
+  build-push:
+    name: Build & Push Image
+    needs: test
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    runs-on: golang
+    steps:
+      - name: Install Node.js and Docker
+        run: |
+          apt-get update
+          apt-get install -y nodejs docker.io
+
+      - name: Checkout code
+        uses: actions/checkout@v4
+
       - name: Get short SHA
         id: sha
-        run: echo "short_sha=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+        run: |
+          SHORT_SHA=$(git rev-parse --short HEAD)
+          echo "short_sha=${SHORT_SHA}" >> $GITHUB_OUTPUT
 
       - name: Registry login
         run: |
@@ -48,13 +60,14 @@ jobs:
           docker build --no-cache \
             -t "${IMAGE}:${{ steps.sha.outputs.short_sha }}" \
             -t "${IMAGE}:latest" \
-            -f Dockerfile .
+            -f Dockerfile \
+            .
 
       - name: Push Docker image
         run: |
           docker push "${IMAGE}:${{ steps.sha.outputs.short_sha }}"
           docker push "${IMAGE}:latest"
-          echo "✓ Pushed: ${IMAGE}:${{ steps.sha.outputs.short_sha }}"
+          echo "✓ Image pushed: ${IMAGE}:${{ steps.sha.outputs.short_sha }}"
 
       - name: Prune unused images
         run: docker image prune -a --force 2>&1 | tail -3 || true