mirror docker/metadata-action@v4

test/Dockerfile

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+# syntax=docker/dockerfile:1
+FROM alpine
+RUN echo "Hello world!"

test/docker-bake.hcl

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+target "docker-metadata-action" {}
+
+group "default" {
+  targets = ["db", "app"]
+}
+
+group "release" {
+  targets = ["db", "app-plus"]
+}
+
+target "db" {
+  context = "./test"
+  tags = ["docker.io/tonistiigi/db"]
+}
+
+target "app" {
+  inherits = ["docker-metadata-action"]
+  context = "./test"
+  dockerfile = "Dockerfile"
+  args = {
+    name = "foo"
+  }
+}
+
+target "cross" {
+  platforms = [
+    "linux/amd64",
+    "linux/arm64",
+    "linux/386"
+  ]
+}
+
+target "app-plus" {
+  inherits = ["app", "cross"]
+  args = {
+    IAMPLUS = "true"
+  }
+}

test/output.Dockerfile

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+# syntax=docker/dockerfile:1
+FROM alpine
+RUN apk add --no-cache coreutils jq
+ARG DOCKER_METADATA_OUTPUT_VERSION
+ARG DOCKER_METADATA_OUTPUT_TAGS
+ARG DOCKER_METADATA_OUTPUT_LABELS
+ARG DOCKER_METADATA_OUTPUT_JSON
+RUN printenv DOCKER_METADATA_OUTPUT_VERSION
+RUN printenv DOCKER_METADATA_OUTPUT_TAGS
+RUN printenv DOCKER_METADATA_OUTPUT_LABELS
+RUN printenv DOCKER_METADATA_OUTPUT_JSON
+RUN echo $DOCKER_METADATA_OUTPUT_JSON | jq