save digest artifacts and parse image name

docker-merge-digests/action.yaml

@@ -1,11 +1,7 @@
-name: Mobilecoin Docker
-description: Standardized docker build and publish actions
+name: Docker Merge Digest
+description: This action takes a list of docker image digests and merges them into a manifest that we can tag and push to a registry. This is useful for creating a manifest list for multi-arch images. Digests are stored as an empty file attached as artifacts to the build by previous steps.
 
 inputs:
-  digest_artifact_prefix:
-    description: Prefix for the artifact names to restore
-    required: false
-    default: ""
   flavor:
     description: New line separated list of docker meta flavor options
     required: false
@@ -35,11 +31,17 @@ outputs:
 runs:
   using: composite
   steps:
+  - name: Parse Image Name
+    shell: bash
+    run: |
+      IMAGE_NAME=${{ inputs.images }}
+      echo "IMAGE_NAME=${IMAGE_NAME#*/}" >> "${GITHUB_ENV}"
+
   - name: Download digests
     uses: mobilecoinofficial/gh-actions/download-artifact@v0
     with:
       path: /tmp/digests
-      pattern: ${{ inputs.digest_artifact_prefix }}*
+      pattern: digests-${{ env.IMAGE_NAME }}*
       merge-multiple: true
 
   - name: Set up Docker Buildx

docker/action.yaml

@@ -53,6 +53,10 @@ inputs:
     description: override the image output methods https://docs.docker.com/build/exporters/
     required: false
     default: ""
+  save_digest:
+    description: save the docker image digest to an artifact
+    required: false
+    default: "false"
 
 outputs:
   tags:
@@ -108,3 +112,27 @@ runs:
       tags: ${{ inputs.outputs == '' && steps.docker_meta.outputs.tags || '' }}
       target: ${{ inputs.target }}
       outputs: ${{ inputs.outputs }}
+
+  - name: Parse Image Name
+    if: inputs.save_digest == 'true'
+    shell: bash
+    run: |
+      IMAGE_NAME=${{ inputs.images }}
+      echo "IMAGE_NAME=${IMAGE_NAME#*/}" >> "${GITHUB_ENV}"
+
+  - name: Export Digest
+    if: inputs.save_digest == 'true'
+    shell: bash
+    run: |
+      mkdir -p /tmp/digests
+      digest="${{ steps.build.outputs.digest }}"
+      touch "/tmp/digests/${digest#sha256:}"
+
+  - name: Upload Digests
+    if: inputs.save_digest == 'true'
+    uses: mobilecoinofficial/gh-actions/upload-artifact@v0
+    with:
+      name: digests-${{ env.IMAGE_NAME }}-${{ runner.arch }}
+      path: /tmp/digests/*
+      if-no-files-found: error
+      retention-days: 1