feat(workflow): Update stage to stage image from single build point

It's not good practice to rebuild images as the scenario exists where the same code base builds different images. As such only use images from a single build point.

1. Pulls the image that matches the git commit
2. Tag image with the specified version and push to ghcr

Issue #31

.github/workflows/stage.yml

@@ -53,17 +53,19 @@ jobs:
         run: |
           python3 -m pip install docker
 
-      - name: Log in to GHCR
-        run: |
-          echo ${{ secrets.GITHUB_TOKEN }} | docker login ghcr.io -u ${{ github.actor }} --password-stdin
 
-      - name: Build and stage awx-operator
-        working-directory: awx-operator
+      - name: Log into registry ghcr.io
+        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+
+      - name: Stage awx-operator
         run: |
-          BUILD_ARGS="--build-arg DEFAULT_AWX_VERSION=${{ github.event.inputs.default_awx_version }} \
-                      --build-arg OPERATOR_VERSION=${{ github.event.inputs.version }}" \
-          IMAGE_TAG_BASE=ghcr.io/${{ github.repository_owner }}/awx-operator \
-          VERSION=${{ github.event.inputs.version }} make docker-build docker-push
+          docker buildx imagetools create ghcr.io/${{ github.repository_owner }}/${{ github.repository }}:${{ github.sha }} --tag ghcr.io/${{ github.repository_owner }}/awx-operator:${{ github.event.inputs.version }}
+
 
       - name: Run test deployment
         working-directory: awx-operator