Renamed workflows and updated version code (#2516)

.github/workflows/build.release.yml

@@ -0,0 +1,31 @@
+env:
+  RUBY_VERSION: 2.7.2
+
+
+name: Build Release
+on:
+  release:
+
+jobs:
+  main:
+    name: Build Docker Image
+    runs-on: ubuntu-18.04
+    steps:
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+        
+      - name: Login to Github Container Registry
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build and Push release
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: |
+            bigbluebutton/greenlight:latest
+            bigbluebutton/greenlight:v2
+            bigbluebutton/greenlight:${{ github.event.release.tag_name }}
+          build-args: version_code=${{ github.event.release.tag_name }}