[skip-ci] Packit/RPM: Display upstream commit SHA in all rpm builds

Packit's `pre-sync` action allows modification of spec file prior to
dist-git PR creation. This is already being done on containers-common
rpm to update c/storage and c/image verions tags in spec.

This commit will allow `podman version` to show `Git Commit: $SHA` for
copr as well as koji builds.

Ref: https://raw.githubusercontent.com/containers/common/refs/heads/main/.packit.yaml

Signed-off-by: Lokesh Mandvekar <lsm5@fedoraproject.org>

rpm/podman.spec

@@ -238,12 +238,10 @@ LDFLAGS="-X %{ld_libpod}/define.buildInfo=${SOURCE_DATE_EPOCH:-$(date +%s)} \
          -X %{ld_libpod}/config._etcDir=%{_sysconfdir} \
          -X %{ld_project}/pkg/systemd/quadlet._binDir=%{_bindir}"
 
-%if %{defined copr_build}
-# ##GIT_COMMIT## is set by `.packit.sh` in Packit's Copr RPM build jobs.
-# Has no effect on Koji builds.
-GIT_COMMIT="##GIT_COMMIT##"
+# This variable will be set by Packit actions. See .packit.yaml in the root dir
+# of the repo (upstream as well as Fedora dist-git).
+GIT_COMMIT=""
 LDFLAGS="$LDFLAGS -X %{ld_libpod}/define.gitCommit=$GIT_COMMIT"
-%endif
 
 # build rootlessport first
 %gobuild -o bin/rootlessport ./cmd/rootlessport