Build skopeo in ci instead of docker

.github/workflows/podman_tests.yaml

@@ -14,8 +14,17 @@ jobs:
         uses: taiki-e/install-action@just
       - name: Install requirements
         run: sudo env PATH=$PATH just ci-prepare
-      - name: Build latest skopeo # because ubuntu 22.04 does not have latest, and podman tests depend on that
-        run: sudo docker build -f ./hack/skopeo.Dockerfile . --target skopeo-rootfs --output=/ && skopeo --version
+      - uses: actions/setup-go@v4
+        with:
+          go-version: '1.20'
+      - name: Download skopeo 1.13.1 source # because ubuntu 22.04 does not have latest, and podman tests depend on that
+        run: mkdir /tmp/skopeo && curl -fsSL "https://github.com/containers/skopeo/archive/v1.13.1.tar.gz" | tar -xzf - -C /tmp/skopeo --strip-components=1
+      - name: Build skopeo
+        run: cd /tmp/skopeo && CGO_ENABLED=0 DISABLE_DOCS=1 make BUILDTAGS=containers_image_openpgp GO_DYN_FLAGS=
+      - name: copy skopeo binaries
+        run: sudo cp /tmp/skopeo/bin/skopeo /usr/local/bin/skopeo && sudo cp /tmp/skopeo/default-policy.json /etc/containers/policy.json
+      - name: Skopeo version
+        run: skopeo --version
       - run: just youki-dev
       - run: sudo cp youki /usr/local/bin
       - name: Install requirements for Podman
@@ -24,9 +33,6 @@ jobs:
         uses: actions/checkout@v3
         with:
           repository: containers/podman
-      - uses: actions/setup-go@v4
-        with:
-          go-version: '1.20'
       - name: Build podman
         run: make binaries 
       - name: Install tools