feat: allow skipping publishing when pushing to default (#97)

.github/workflows/ci.yml

@@ -4,7 +4,7 @@ on:
       aws_ecr_registry:
         description: |
             The AWS ECR registry that will be used to publish images
-        required: true
+        required: false
         type: string
       aws_role_arn:
         description: |
@@ -45,6 +45,13 @@ on:
         required: false
         type: boolean
         default: false
+      skip_publish_on_default:
+        description: |
+          If set to true, images will not be published when the workflow is
+          triggered by a push to the default branch.
+        required: false
+        type: boolean
+        default: false
       tags:
         description: |
           A line separated list of additional tags that will be applied to
@@ -154,6 +161,7 @@ jobs:
       aws_region: ${{ inputs.aws_region }}
       ci_cli_version: ${{ inputs.ci_cli_version }}
       earthly_version: ${{ inputs.earthly_version }}
+      skip_publish_on_default: ${{ inputs.skip_publish_on_default }}
       tags: ${{ inputs.tags }}
     secrets:
       dockerhub_token: ${{ secrets.dockerhub_token }}

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ on:
       aws_ecr_registry:
         description: |
             The AWS ECR registry that will be used to publish images
-        required: true
+        required: false
         type: string
       aws_role_arn:
         description: |
@@ -40,6 +40,13 @@ on:
         required: false
         type: string
         default: latest
+      skip_publish_on_default:
+        description: |
+          If set to true, images will not be published when the workflow is
+          triggered by a push to the default branch.
+        required: false
+        type: boolean
+        default: false
       tags:
         description: |
           A line separated list of additional tags that will be applied to
@@ -127,7 +134,7 @@ jobs:
           runner_address: ${{ secrets.earthly_runner_address }}
       - name: Push image
         uses: input-output-hk/catalyst-ci/actions/push@master
-        if: github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
+        if: github.ref == format('refs/heads/{0}', github.event.repository.default_branch) && !inputs.skip_publish_on_default
         with:
           image: ${{ steps.build.outputs.image }}
           registries: |

actions/push/README.md

@@ -4,6 +4,8 @@
 
 This Github Action will attach a variable number of tags to a given image and then push all variants to a list of image registries.
 This is often useful when a single image needs to be tagged multiple times and pushed to multiple registries.
+Note that for the `registries` input, empty lines will be ignored.
+As a result, you can pass template variables that may or may not be empty (useful for handling optional registries).
 
 To see a full demonstration of this action, see the [publish workflow](../../.github/workflows/publish.yml).
 

actions/push/dist/index.js

@@ -4135,6 +4135,9 @@ async function run() {
         const tags = core.getInput('tags').split('\n');
         const imageName = image.split(':')[0];
         for (const registry of registries) {
+            if (registry === '') {
+                continue;
+            }
             for (const tag of tags) {
                 const fullImage = `${registry}/${imageName}:${tag}`;
                 core.info(`Tagging ${image} as ${fullImage}`);

actions/push/src/push.test.ts

@@ -24,7 +24,7 @@ describe('Discover Action', () => {
           case 'image':
             return 'image:latest'
           case 'registries':
-            return 'registry1\nregistry2'
+            return '\nregistry1\nregistry2'
           case 'tags':
             return 'tag1\ntag2'
           default:

actions/push/src/push.ts

@@ -10,6 +10,10 @@ export async function run(): Promise<void> {
     const imageName = image.split(':')[0]
 
     for (const registry of registries) {
+      if (registry === '') {
+        continue
+      }
+
       for (const tag of tags) {
         const fullImage = `${registry}/${imageName}:${tag}`