first commit

Dockerfile

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+FROM docker.io/moby/buildkit:master-rootless
+COPY entrypoint.sh /usr/local/bin/
+ENTRYPOINT ["entrypoint.sh"]

README.md

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+# buildah@v1

action.yaml

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+inputs:
+  dockerfile:
+    description: Dockerfile path
+    default: ./Dockerfile
+  image:
+    description: Image name and tag
+    default: ${{ forgejo.repository }}:${{ forgejo.ref_name }}
+  username:
+    description: Registry username
+    default: ${{ forgejo.repository_owner }}
+  password:
+    description: Registry password
+    required: true
+  cache:
+    description: Use registry cache
+    default: true
+
+runs:
+  using: docker
+  image: Dockerfile

entrypoint.sh

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+#!/bin/sh -ex
+
+#shellcheck disable=SC1091
+[ -f .env ] && . ./.env
+
+if [ -z "$IMAGEAPP" ]; then
+    REGISTRY="$(echo "$GITHUB_SERVER_URL" | sed 's .*://  ')"
+    IMAGEAPP="$REGISTRY/$INPUT_IMAGE"
+fi
+
+if [ "$INPUT_CACHE" = true ]; then
+    set -- --import-cache "type=registry,ref=$IMAGEAPP/cache" \
+           --export-cache "type=registry,ref=$IMAGEAPP/cache"
+fi
+
+cat <<EOF > "$DOCKER_CONFIG/config.json"
+{
+  "auths": {
+    "$GITHUB_SERVER_URL": {
+      "username": "$INPUT_USERNAME",
+      "password": "$INPUT_PASSWORD"
+    }
+  }
+}
+EOF
+buildctl build "$@" -o "type=image,name=$IMAGEAPP,push=true" \
+    --local context="$(dirname "$INPUT_DOCKERFILE")" \
+    --local dockerfile="$INPUT_DOCKERFILE"