Split out the CI test that pushes new container to Dockerhub, only run this on pushes to main

Author: mkavulich

.github/workflows/build_and_push_docker_latest.yml

@@ -0,0 +1,34 @@
+name: build_test_and_push_docker
+
+on:
+  push:
+    branches:
+      # Only build containers when pushing to main
+      - "main"
+
+env:
+  LATEST_TAG: NCAR/ccpp-scm:latest
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - 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: Push latest tag
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: docker/Dockerfile
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ env.LATEST_TAG }}

.github/workflows/ci_test_docker.yml

@@ -1,13 +1,9 @@
 name: build_test_and_push_docker
 
-on:
-  push:
-#    branches:
-#      - "main"
+on: [pull_request,workflow_dispatch]
 
 env:
-  TEST_TAG: mkavulich/ccpp-scm:test
-  LATEST_TAG: mkavulich/ccpp-scm:latest
+  TEST_TAG: NCAR/ccpp-scm:test
 
 jobs:
   docker:
@@ -33,15 +29,6 @@ jobs:
           tags: ${{ env.TEST_TAG }}
       - name: Test
         run: |
-          docker pull ${{ env.TEST_TAG }}
           mkdir $HOME/output
           chmod a+rw $HOME/output
           docker run --rm -v $HOME/output:/home ${{ env.TEST_TAG }} ./run_scm.py -f ../../test/rt_test_cases.py --runtime_mult 0.1 -d
-      - name: Push latest tag
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          file: docker/Dockerfile
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: ${{ env.LATEST_TAG }}