Add conditional release-checking system test

Unfortunately on a number of occasions, Podman has been released
officially with a `-dev` suffix in the version number.  Assist in
catching this mistake at release time by the addition of a simple
conditional test.  Note that it must be positively enabled by a
magic env. var. before executing the system tests.

Also (thanks to @lsm5) update the TMT test to trigger the new
condition for future Fedora releases.

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

test/system/001-basic.bats

@@ -280,4 +280,13 @@ run_podman --noout system connection ls
     is "$output" ".*Shutting down engines.*"
 }
 
+@test "release" {
+  [[ "${RELEASE_TESTING:-false}" == "true" ]] || \
+    skip "Release testing may be enabled by setting \$RELEASE_TESTING = 'true'."
+
+  run_podman --version
+
+  assert "$output" "!~" "dev" "The Podman version string does not mention 'dev'."
+}
+
 # vim: filetype=sh

test/tmt/system.fmf

@@ -14,6 +14,9 @@ adjust+:
     - when: distro == rhel
       environment+:
         ROOTLESS_USER: "cloud-user"
+    - when: initiator != "packit"
+      environment+:
+        RELEASE_TESTING: true
 
 /local-root:
     tag: [ local, root ]