Cirrus: Remove remnants of nix-based static build

Simply a readme update and dead-code cleanup.

Signed-off-by: Chris Evich <cevich@redhat.com>

README.md

@@ -166,13 +166,3 @@ familiar container cli commands.  For more details, see the
 Podman formerly offered a Varlink-based API for remote management of containers. However, this API
 was replaced by the REST API. Varlink support has been removed as of the 3.0 release.
 For more details, you can see [this blog](https://podman.io/blogs/2020/01/17/podman-new-api.html).
-
-## Static Binary Builds
-The Cirrus CI integration within this repository contains a `Static_Build` job
-which produces static Podman binaries for testing purposes. Please note that
-these binaries are not officially supported with respect to feature-completeness
-and functionality and should be only used for testing. To download these binaries,
-load the build link with the commit SHA at
-[main](https://cirrus-ci.com/github/containers/podman/main) or
-`https://cirrus-ci.com/github/containers/podman/pull/<selected PR>`
-and open the artifacts folder within `Static Build`.

contrib/cirrus/runner.sh

@@ -259,20 +259,6 @@ function _run_altbuild() {
                 make podman-release-${arch}.tar.gz GOARCH=$arch
             done
             ;;
-        *Static*)
-            req_env_vars CTR_FQIN
-            [[ "$UID" -eq 0 ]] || \
-                die "Static build must execute nixos container as root on host"
-            podman run -i --rm \
-                -e CACHIX_AUTH_TOKEN \
-                -v $PWD:$PWD:Z -w $PWD $CTR_FQIN sh -c \
-                "nix-env -iA cachix -f https://cachix.org/api/v1/install && \
-                 cachix use podman && \
-                 nix-build nix && \
-                 nix-store -qR --include-outputs \$(nix-instantiate nix/default.nix) | grep -v podman | cachix push podman && \
-                 cp -R result/bin ."
-            rm result  # makes cirrus puke
-            ;;
         *)
             die "Unknown/Unsupported \$$ALT_NAME '$ALT_NAME'"
     esac