GRN2-346: Another attempt at short sha (#2508)

* Short sha

* Another try at short sha

.github/workflows/cd-push.yml

@@ -1,34 +1,34 @@
-env:
-  RUBY_VERSION: 2.7.2
-
-
-name: CD Push
-on:
-  push:
-    branches: "master"
-
-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: ${{ secrets.DOCKER_PASSWORD }}
-
-      - name: Step for Short SHA
-        run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
-
-      - name: Build and Push latest
-        uses: docker/build-push-action@v2
-        with:
-          push: true
-          tags: |
-            bigbluebutton/greenlight:master
-            bigbluebutton/greenlight:latest
-          build-args: version_code=${{ steps.vars.outputs.sha_short  }}
+env:
+  RUBY_VERSION: 2.7.2
+
+
+name: CD Push
+on:
+  push:
+    branches: "master"
+
+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: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Step Short SHA
+        run: echo "::set-output short_sha=${GITHUB_SHA::8}"
+
+      - name: Build and Push latest
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: |
+            bigbluebutton/greenlight:master
+            bigbluebutton/greenlight:latest
+          build-args: version_code=${{ steps.vars.outputs.short_sha  }}