build/bake: meta-pr-head-sha input

See docker/metadata-action#206

Signed-off-by: bo0tzz <git@bo0tzz.me>

Author: bo0tzz

.github/workflows/bake.yml

@@ -122,6 +122,11 @@ on:
         type: string
         description: "List of custom annotations"
         required: false
+      meta-pr-head-sha:
+        type: boolean
+        description: "Use the PR head SHA on pull_request events instead of GitHub's synthetic merge commit (sets DOCKER_METADATA_PR_HEAD_SHA)"
+        required: false
+        default: false
       meta-bake-target:
         type: string
         description: "Bake target name for metadata (defaults to docker-metadata-action)"
@@ -609,6 +614,8 @@ jobs:
         id: meta
         if: ${{ inputs.output == 'image' }}
         uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf # v6.0.0
+        env:
+          DOCKER_METADATA_PR_HEAD_SHA: ${{ inputs.meta-pr-head-sha }}
         with:
           images: ${{ needs.prepare.outputs.metaImages }}
           tags: ${{ inputs.meta-tags }}
@@ -1084,6 +1091,8 @@ jobs:
         id: meta
         if: ${{ inputs.output == 'image' }}
         uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf # v6.0.0
+        env:
+          DOCKER_METADATA_PR_HEAD_SHA: ${{ inputs.meta-pr-head-sha }}
         with:
           images: ${{ needs.prepare.outputs.metaImages }}
           tags: ${{ inputs.meta-tags }}

.github/workflows/build.yml

@@ -129,6 +129,11 @@ on:
         type: string
         description: "Flavor defines a global behavior for meta-tags"
         required: false
+      meta-pr-head-sha:
+        type: boolean
+        description: "Use the PR head SHA on pull_request events instead of GitHub's synthetic merge commit (sets DOCKER_METADATA_PR_HEAD_SHA)"
+        required: false
+        default: false
     secrets:
       registry-auths:
         description: "Raw authentication to registries, defined as YAML objects (for image output)"
@@ -502,6 +507,8 @@ jobs:
         id: meta
         if: ${{ inputs.output == 'image' }}
         uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf # v6.0.0
+        env:
+          DOCKER_METADATA_PR_HEAD_SHA: ${{ inputs.meta-pr-head-sha }}
         with:
           images: ${{ needs.prepare.outputs.metaImages }}
           tags: ${{ inputs.meta-tags }}
@@ -940,6 +947,8 @@ jobs:
         id: meta
         if: ${{ inputs.output == 'image' }}
         uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf # v6.0.0
+        env:
+          DOCKER_METADATA_PR_HEAD_SHA: ${{ inputs.meta-pr-head-sha }}
         with:
           images: ${{ needs.prepare.outputs.metaImages }}
           tags: ${{ inputs.meta-tags }}

README.md

@@ -233,6 +233,7 @@ jobs:
 | `meta-images`          | List     |                                       | [List of images](https://github.com/docker/metadata-action?tab=readme-ov-file#images-input) to use as base name for tags (required for image output)                                                                                                                                                           |
 | `meta-tags`            | List     |                                       | [List of tags](https://github.com/docker/metadata-action?tab=readme-ov-file#tags-input) as key-value pair attributes                                                                                                                                                                                           |
 | `meta-flavor`          | List     |                                       | [Flavor](https://github.com/docker/metadata-action?tab=readme-ov-file#flavor-input) defines a global behavior for `meta-tags`                                                                                                                                                                                  |
+| `meta-pr-head-sha`     | Bool     | `false`                               | Use the PR head SHA on `pull_request` events instead of GitHub's synthetic merge commit (sets [`DOCKER_METADATA_PR_HEAD_SHA`](https://github.com/docker/metadata-action#environment-variables))                                                                                                                |
 
 ### Secrets
 
@@ -342,6 +343,7 @@ jobs:
 | `meta-labels`          | List   |                                       | [List of custom labels](https://github.com/docker/metadata-action?tab=readme-ov-file#overwrite-labels-and-annotations)                                                                                                                                                                               |
 | `meta-annotations`     | List   |                                       | [List of custom annotations](https://github.com/docker/metadata-action?tab=readme-ov-file#overwrite-labels-and-annotations)                                                                                                                                                                          |
 | `meta-flavor`          | List   |                                       | [Flavor](https://github.com/docker/metadata-action?tab=readme-ov-file#flavor-input) defines a global behavior for `meta-tags`                                                                                                                                                                        |
+| `meta-pr-head-sha`     | Bool   | `false`                               | Use the PR head SHA on `pull_request` events instead of GitHub's synthetic merge commit (sets [`DOCKER_METADATA_PR_HEAD_SHA`](https://github.com/docker/metadata-action#environment-variables))                                                                                                      |
 
 ### Secrets