Allow containers/common to use internal TF (#583)

<!-- TODO list -->

TODO:

- [ ] Write new tests or update the old ones to cover new functionality.
- [ ] Update doc-strings where appropriate.
- [ ] Update or write new documentation in `packit/packit.dev`.
- [ ] ‹fill in›

<!-- notes for reviewers -->

<!-- Links to other issues or pull requests,
for cross-repository links use: ‹namespace›/‹repository›#‹ID of issue›
       (‹namespace›/‹repository›!‹ID of PR› respectively)
-->

Fixes

Related to

Merge before/after

<!-- release notes footer -->

RELEASE NOTES BEGIN

Packit now supports automatic ordering of ☕ after all checks pass.

RELEASE NOTES END

secrets/packit/prod/packit-service.yaml.j2

@@ -26,6 +26,7 @@ enabled_projects_for_internal_tf:
   - github.com/RedHat-SP-Security/keylime-selinux
   - github.com/containers/aardvark-dns
   - github.com/containers/buildah
+  - github.com/containers/common
   - github.com/containers/container-selinux
   - github.com/containers/crun
   - github.com/containers/netavark

secrets/packit/stg/packit-service.yaml.j2

@@ -27,6 +27,7 @@ enabled_projects_for_internal_tf:
   - github.com/RedHat-SP-Security/keylime-selinux
   - github.com/containers/aardvark-dns
   - github.com/containers/buildah
+  - github.com/containers/common
   - github.com/containers/container-selinux
   - github.com/containers/crun
   - github.com/containers/netavark