add undock (#29048)

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Signed-off-by: Dentrax <[email protected]>

undock.yaml

@@ -0,0 +1,65 @@
+package:
+  name: undock
+  version: 0.8.0
+  epoch: 0
+  description: Extract contents of a container image in a local folder
+  copyright:
+    - license: MIT
+
+environment:
+  contents:
+    packages:
+      - btrfs-progs-dev
+      - build-base
+      - busybox
+      - ca-certificates-bundle
+      - gpgme-dev
+      - libassuan-dev
+      - libgpg-error-dev
+
+pipeline:
+  - uses: git-checkout
+    with:
+      repository: https://github.com/crazy-max/undock
+      tag: v${{package.version}}
+      expected-commit: adfc8cf74aa5ea70cd5e28c954022d791d1cf4fd
+
+  - uses: go/bump
+    with:
+      deps: github.com/docker/[email protected] github.com/docker/[email protected]
+
+  - uses: go/build
+    with:
+      ldflags: -X main.version=v${{package.version}}
+      output: undock
+      packages: ./cmd/
+      vendor: true
+
+  - uses: strip
+
+update:
+  enabled: true
+  github:
+    identifier: crazy-max/undock
+    strip-prefix: v
+    use-tag: true
+
+test:
+  environment:
+    accounts:
+      groups:
+        - groupname: nginx
+          gid: 65532
+      users:
+        - username: nginx
+          gid: 65532
+          uid: 65532
+  pipeline:
+    - runs: undock --help
+    # https://crazymax.dev/undock/usage/examples/
+    # The `handling file: dev/console: cannot handle file mode: Dcrw--w----` error is expected
+    # since the `dev/console` file is a device and cannot be extracted.
+    - name: Simple
+      runs: undock --rm-dist cgr.dev/chainguard/busybox:latest /home/build/out 2>&1 | grep "Extracting"
+    - name: Extract a multi-platform image
+      runs: undock --rm-dist --all cgr.dev/chainguard/busybox:latest /home/build/out 2>&1 | grep "Extracting"