docker-compose: Switch to docker compose v2

docker-compose v1 (implemented in Python) has stopped receiving update
in July 2023 and the version installed on Cirrus's docker_builder image
is incompatible with the latest docker-py version, resulting in total
test failures.

This commit switches over the docker-compose invocations to 'docker
compose' as required by docker compose v2. compose is now a plugin of
docker, implemented in Go. It's installable on Ubuntu, for example,
as docker-compose-v2 package.

Scripts/docker-compose-teardown

@@ -12,7 +12,7 @@ if docker ps -a | grep -q $controller; then
 fi
 
 # Grab the Docker logs
-docker-compose -p ${testname}_ -f docker-compose.yml logs >docker-compose.logs
+docker compose -p ${testname}_ -f docker-compose.yml logs >docker-compose.logs
 
 [ -n "$TEST_SKIP_DOCKER_TEARDOWN" ] && exit 0
 [ "$TEST_FAILED" -eq 1 ] && [ -n "$TEST_SKIP_DOCKER_TEARDOWN_ON_FAILURE" ] && exit 0
@@ -28,6 +28,6 @@ if [ ! -f docker-compose.yml ]; then
 fi
 
 # Don't wait at all for clean container shutdown
-docker-compose -p ${testname}_ -f docker-compose.yml down -t 0
+docker compose -p ${testname}_ -f docker-compose.yml down -t 0
 
 exit 0

Scripts/docker-requirements

@@ -11,8 +11,8 @@ command -v docker >/dev/null || {
     exit 1
 }
 
-command -v docker-compose >/dev/null || {
-    echo "docker-compose command unavailable"
+docker compose version >/dev/null || {
+    echo "docker compose plugin unavailable"
     exit 1
 }
 

Scripts/docker-setup

@@ -46,16 +46,16 @@ docker_populate() {
     fi
 }
 
-# The corresponding "docker-compose down" happens in docker-compose-teardown.
+# The corresponding "docker compose down" happens in docker-compose-teardown.
 # Might shift this around in the future for better symmetry.
 docker_compose_up() {
     local config1="${1:-docker-compose.yml}"
     local config2="${2:-docker-compose.override.yml}"
 
     if [ -f "${config2}" ]; then
-        docker-compose -p ${testname} -f "$config1" -f "$config2" up -d
+        docker compose -p ${testname} -f "$config1" -f "$config2" up -d
     else
-        docker-compose -p ${testname} -f "$config1" up -d
+        docker compose -p ${testname} -f "$config1" up -d
     fi
 }