refactor: update Docker workflow for build validation and remove unnecessary steps

.github/workflows/docker.yml

@@ -10,9 +10,8 @@ on:
 
 jobs:
   docker:
-    name: Docker Dev Build & Push
+    name: Docker Build Validation
     runs-on: ubuntu-latest
-    environment: prod
     permissions:
       contents: read
 
@@ -20,43 +19,14 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v5
 
-      - name: Set up variables
-        id: vars
-        run: |
-          echo "sha_short=$(git rev-parse --short HEAD)" >> "${GITHUB_OUTPUT}"
-          echo "date=$(date +%Y-%m-%d)" >> "${GITHUB_OUTPUT}"
-
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Login to Docker Hub
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-
-      - name: Extract metadata for Docker
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: rangermix/twitch-drops-miner
-          tags: |
-            type=raw,value=dev
-            type=raw,value=dev-${{steps.vars.outputs.sha_short}}
-            type=raw,value=latest,enable=${{github.ref == 'refs/heads/master'}}
-            type=sha,prefix=
-
-      - name: Build and push Docker image
+      - name: Build Docker image
         uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/amd64,linux/arm64
-          push: true
-          tags: ${{steps.meta.outputs.tags}}
-          labels: ${{steps.meta.outputs.labels}}
+          push: false
           cache-from: type=gha
           cache-to: type=gha,mode=max
-          build-args: |
-            BUILD_DATE=${{steps.vars.outputs.date}}
-            VCS_REF=${{github.sha}}
-            VERSION=dev-${{steps.vars.outputs.sha_short}}