Add tests with Docker Compose v2

Add a pair of new Cirrus test suites using Compose v2 instead of
Compose v1 (as is currently packaged in Fedora). They work
identically, and run the same tests, as the Compose v1 tests, but
with the new v2 binary instead.

[NO NEW TESTS NEEDED] This adds an entire Cirrus suite...

Signed-off-by: Matthew Heon <mheon@redhat.com>

.cirrus.yml

@@ -429,7 +429,7 @@ apiv2_test_task:
 
 
 compose_test_task:
-    name: "compose test on $DISTRO_NV ($PRIV_NAME)"
+    name: "$TEST_FLAVOR test on $DISTRO_NV ($PRIV_NAME)"
     alias: compose_test
     only_if: *not_build
     skip: *tags
@@ -438,11 +438,18 @@ compose_test_task:
     gce_instance: *standardvm
     env:
         <<: *stdenvars
-        TEST_FLAVOR: compose
     matrix:
       - env:
+            TEST_FLAVOR: compose
             PRIV_NAME: root
       - env:
+            TEST_FLAVOR: compose
+            PRIV_NAME: rootless
+      - env:
+            TEST_FLAVOR: compose_v2
+            PRIV_NAME: root
+      - env:
+            TEST_FLAVOR: compose_v2
             PRIV_NAME: rootless
     clone_script: *noop  # Comes from cache
     gopath_cache: *ro_gopath_cache

contrib/cirrus/runner.sh

@@ -63,6 +63,10 @@ function _run_compose() {
     ./test/compose/test-compose |& logformatter
 }
 
+function _run_compose_v2() {
+    ./test/compose/test-compose |& logformatter
+}
+
 function _run_int() {
     dotest integration
 }

contrib/cirrus/setup_environment.sh

@@ -272,6 +272,11 @@ case "$TEST_FLAVOR" in
         ;;
     build) make clean ;;
     unit) ;;
+    compose_v2)
+        dnf -y remove docker-compose
+        curl -SL https://github.com/docker/compose/releases/download/v2.2.3/docker-compose-linux-x86_64 -o /usr/local/bin/docker-compose
+        chmod +x /usr/local/bin/docker-compose
+        ;& # Continue with next item
     apiv2)
         msg "Installing previously downloaded/cached packages"
         dnf install -y $PACKAGE_DOWNLOAD_DIR/python3*.rpm