Add slack message sending + upgrade docker build process

.github/workflows/main.yml

@@ -102,13 +102,23 @@ jobs:
     if: github.event_name == 'push' && (github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/tags/v'))
 
     steps:
-      - name: Publish to Docker Registry
+      - name: Docker meta
-        uses: docker/build-push-action@v1
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: simplelogin/app-ci
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
         with:
-          repository: simplelogin/app-ci
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
-          tag_with_ref: true
+
+      - name: Build image and publish to Docker Registry
+        uses: docker/build-push-action@v3
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
 
       - name: Create Sentry release
         uses: getsentry/action-release@v1
@@ -123,3 +133,11 @@ jobs:
           to: ${{ secrets.TELEGRAM_TO }}
           token: ${{ secrets.TELEGRAM_TOKEN }}
           args: Docker image pushed on ${{ github.ref }}
+
+      - name: Post notification to Slack
+        uses: slackapi/slack-github-action@v1.19.0
+        with:
+          channel-id: ${{ secrets.SLACK_CHANNEL_ID }}
+          slack-message: "New tag generated: ${{github.ref}}\nBuild result: ${{ job.status }}"
+        env:
+          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}