init commit

Dockerfile

@@ -0,0 +1,11 @@
+FROM quay.io/buildah/upstream:latest
+
+# Add skopeo.
+RUN dnf install -y skopeo \
+    --exclude container-selinux \
+    --enablerepo=updates-testing
+
+# Add wget, use it to install cosign.
+RUN dnf install -y wget && \
+    wget https://github.com/sigstore/cosign/releases/download/v2.5.2/cosign-2.5.2-1.x86_64.rpm && \
+    rpm -ivh cosign*.rpm