Update main.yml

Author: susch19

.github/workflows/main.yml

@@ -49,7 +49,7 @@ jobs:
       
       - name: Build AppBroker and push Docker image
         uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
-        if: ${{ env.GITHUB_REF_NAME }} == 'master'
+        if: github.ref == 'refs/heads/master'
         with:
           context: .
           platforms: linux/amd64,linux/arm/v7
@@ -60,7 +60,7 @@ jobs:
 
       - name: Build AppBroker and push Docker image feature branch
         uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
-        if: ${{ env.GITHUB_REF_NAME }} != 'master'
+        if: github.ref != 'refs/heads/master'
         with:
           context: .
           platforms: linux/amd64,linux/arm/v7
@@ -71,7 +71,7 @@ jobs:
 
       - name: Build TCPProxy and push Docker image
         uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
-        if: ${{ env.GITHUB_REF_NAME }} == 'master'
+        if: github.ref == 'refs/heads/master'
         with:
           context: .
           platforms: linux/amd64,linux/arm/v7
@@ -83,7 +83,7 @@ jobs:
 
       - name: Build TCPProxy and push Docker image feature branch
         uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
-        if: ${{ env.GITHUB_REF_NAME }} != 'master'
+        if: github.ref != 'refs/heads/master'
         with:
           context: .
           platforms: linux/amd64,linux/arm/v7