alternatively use dockerhub instead of gpr

Author: Patrick Poetz

.github/workflows/main.yml

@@ -11,7 +11,7 @@ jobs:
         uses: actions/checkout@v1
         with:
           fetch-depth: 1
-      - name: Build and Publish Docker image
+      - name: Build and Publish Docker image in GPR
         uses: saubermacherag/gpr-docker-publish@master
         with:
           USERNAME: x-access-token
@@ -20,3 +20,12 @@ jobs:
           IMAGE_TAG: 'v0.0'
           DOCKERFILE_PATH: '.github/docker/Dockerfile'
           BUILD_CONTEXT: './'
+      - name: Build and Publish Docker image in GPR
+        uses: saubermacherag/gpr-docker-publish@master
+        with:
+          USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
+          PASSWORD: ${{ secrets.DOCKERHUB_PAT }}
+          IMAGE_TAG: 'v0.0'
+          DOCKERFILE_PATH: '.github/docker/Dockerfile'
+          BUILD_CONTEXT: './'
+          DOCKERHUB_REPOSITORY: 'pinkrobin/docker-ansible-alpine'

README.md

@@ -82,6 +82,8 @@ jobs:
 
 1. `cache`: if value is `true`, attempts to use the last pushed image as a cache.  Default value is `false`.
 2. `IMAGE_TAG`: if value is set, use provided value.  Default value is the first 12 characters of the GitHub SHA that triggered the action.
+3. `DOCKERHUB_REPOSITORY`: if value is set, you don't need to set `IMAGE_NAME`. It will push the image to the given dockerhub repository instead of using GPR.
+Why? Because Github Actions don't support downloading images without authentication at the moment. See: https://github.community/t5/GitHub-Actions/docker-pull-from-public-GitHub-Package-Registry-fail-with-quot/m-p/32782
 
 ## Outputs
 

action.yaml

@@ -26,6 +26,9 @@ inputs:
   image_tag:
     description: Optional input to set a tag name instead of a hash.
     required: false
+  dockerhub_repository:
+    description: Optional input to push image to dockerhub repository instead of GPR.
+    required: false
 outputs:
   IMAGE_SHA_NAME:
     description: name of the Docker Image including the tag

entrypoint.sh

@@ -17,8 +17,8 @@ if [[ -z "$INPUT_PASSWORD" ]]; then
 	exit 1
 fi
 
-if [[ -z "$INPUT_IMAGE_NAME" ]]; then
-	echo "Set the IMAGE_NAME input."
+if [[ -z "$INPUT_IMAGE_NAME" && -z "$INPUT_DOCKERHUB_REPOSITORY" ]]; then
+	echo "Set either the IMAGE_NAME or a valid DOCKERHUB_REPOSITORY."
 	exit 1
 fi
 
@@ -40,11 +40,17 @@ fi
 
 # The following environment variables will be provided by the environment automatically: GITHUB_REPOSITORY, GITHUB_SHA
 
+if [[ -z "$INPUT_DOCKERHUB_REPOSITORY" ]]; then
+  DOCKER_REGISTRY=docker.pkg.github.com
+  BASE_NAME="${DOCKER_REGISTRY}/${GITHUB_REPOSITORY}/${INPUT_IMAGE_NAME}"
+else
+  BASE_NAME="${INPUT_DOCKERHUB_REPOSITORY}"
+fi
+
 # send credentials through stdin (it is more secure)
-echo ${INPUT_PASSWORD} | docker login -u ${INPUT_USERNAME} --password-stdin docker.pkg.github.com
+echo ${INPUT_PASSWORD} | docker login -u ${INPUT_USERNAME} --password-stdin ${DOCKER_REGISTRY}
 
 # Set Local Variables
-BASE_NAME="docker.pkg.github.com/${GITHUB_REPOSITORY}/${INPUT_IMAGE_NAME}"
 SHA_NAME="${BASE_NAME}:${IMAGE_TAG}"
 
 # Build additional tags based on the GIT Tags pointing to the current commit
@@ -74,4 +80,8 @@ docker push ${BASE_NAME}
 docker push ${SHA_NAME}
 
 echo "::set-output name=IMAGE_SHA_NAME::${SHA_NAME}"
-echo "::set-output name=IMAGE_URL::https://github.com/${GITHUB_REPOSITORY}/packages"
+if [[ -z "$INPUT_DOCKERHUB_REPOSITORY" ]]; then
+  echo "::set-output name=IMAGE_URL::https://github.com/${GITHUB_REPOSITORY}/packages"
+else
+  echo "::set-output name=IMAGE_URL::https://hub.docker.com/r/${INPUT_DOCKERHUB_REPOSITORY}"
+fi