+github.com/containers/skopeo (#3465)

* +github.com/containers/skopeo

Closes #2695

* Speed up test

* Use hello-world image in all tests

* Clarify build instructions

* Disable man pages generation

* make and cc now handled by brewkit

* Use patch instead of git apply

* Pin patch to a commit id

* Use /releases/tags

* ops, alpine.tar

---------

Co-authored-by: Jacob Heider <jacob@tea.xyz>

projects/github.com/containers/skopeo/package.yml

@@ -0,0 +1,41 @@
+distributable:
+  url: https://github.com/containers/skopeo/archive/v{{ version }}.tar.gz
+  strip-components: 1
+
+versions:
+  github: containers/skopeo/releases/tags
+
+provides:
+  - bin/skopeo
+
+dependencies:
+  curl.se/ca-certs: "*"
+
+build:
+  dependencies:
+    go.dev: "^1.18"
+    curl.se: "*"
+    gnu.org/patch: "*"
+  env:
+    DISABLE_DOCS: 1 # disables the generation of man pages with go-md2man
+  script: |
+    # bundles default-policy.json into the binary to provide a working out-of-the-box experience
+    # https://github.com/containers/skopeo/pull/2014
+    curl -fsSL https://github.com/containers/skopeo/commit/fb180f03ca43ea7a9130a48639f483fa46cffe50.diff |
+      patch -p1
+
+    # https://github.com/containers/skopeo/blob/2d1ae1fdb3d88347eec8a17d4415a964ce86d54f/install.md#building-a-static-binary
+    CGO_ENABLED=0 make BUILDTAGS=containers_image_openpgp GO_DYN_FLAGS=
+
+    mkdir -p '{{prefix}}/bin'
+    mv -f ./bin/skopeo '{{prefix}}/bin'
+
+test:
+  script: |
+    skopeo --version | tee /dev/stderr | grep -q -w '{{ version }}'
+
+    skopeo --override-os linux inspect docker://hello-world | tee /dev/stderr |
+      grep -q -w 'docker.io/library/hello-world'
+
+    skopeo --override-os linux copy docker://hello-world docker-archive:hello-world.tar
+    test -f hello-world.tar