Solve issue when image is present in Podman and Docker both (#16)

* Solve issue when image is present in Podman and Docker both

If updated docker image is present in docker env then
docker image won't get used if image same name and tag
is already present in podman env.
To fix this, selected latest built image and removed the
image at the end from the podman env if image is pulled
from docker env.

Signed-off-by: divyansh42 <[email protected]>

.eslintrc.js

@@ -0,0 +1,6 @@
+// eslint-disable-next-line no-undef
+module.exports = {
+    extends: [
+        "@redhat-actions/eslint-config",
+    ],
+};

.github/workflows/verify-push.yaml

@@ -1,10 +1,10 @@
 # This workflow will perform a test whenever there
 # is some change in code done to ensure that the changes
 # are not buggy and we are getting the desired output.
-name: Test Push
-on: [ push, pull_request, workflow_dispatch ]
+name: Test Push without image
+on: [ push, workflow_dispatch ]
 env:
-  IMAGE_NAME: hello-world
+  IMAGE_NAME: myimage
   IMAGE_REGISTRY: quay.io
   IMAGE_TAG: latest
 
@@ -17,9 +17,12 @@ jobs:
       - name: Checkout Push to Registry action
         uses: actions/checkout@v2
 
-      # Pull hello-world image to push in next step
-      - name: Pull Hello world image
-        run: docker pull ${{ env.IMAGE_NAME }}
+      - name: Build Image using Docker
+        run: |
+          docker build -t ${{ env.IMAGE_NAME }}:latest -<<EOF
+          FROM busybox
+          RUN echo "hello world"
+          EOF
 
       # Push the image to image registry
       - name: Push To Quay
@@ -32,7 +35,6 @@ jobs:
           username: ${{ secrets.REGISTRY_USER }}
           password: ${{ secrets.REGISTRY_PASSWORD }}
 
-
       - name: Echo outputs
         run: |
           echo "registry-path ${{ steps.push.outputs.registry-path }}"

README.md

@@ -120,6 +120,16 @@ jobs:
       run: echo "New image has been pushed to ${{ steps.push-to-quay.outputs.registry-path }}"
 ```
 
+## Note about images built with Docker
+
+This action uses `Podman` to push, but can also push images built with `Docker`. However, Docker and Podman store their images in different locations, and Podman can only push images in its own storage.
+
+If the image to push is present in the Docker image storage but not in the Podman image storage, it will be pulled into Podman's storage.
+
+If the image to push is present in both the Docker and Podman image storage, the action will push the image which was more recently built, and log a warning.
+
+If the action pulled an image from the Docker image storage into the Podman storage, it will be cleaned up from the Podman storage before the action exits.
+
 ## Troubleshooting
 Note that quay.io repositories are private by default.<br>