Merge branch 'cdalvaro/podman_support'

Closes #16

compose-check.sh

@@ -2,19 +2,31 @@
 # Verifies that files passed in are valid for docker-compose
 set -e
 
-if command -v docker &> /dev/null && docker help compose &> /dev/null; then
-    COMPOSE="docker compose"
-elif command -v docker-compose &> /dev/null ; then
-    COMPOSE=docker-compose
+# Check if docker or podman commands are available
+if [[ -z "${CONTAINER_ENGINE}" ]]; then
+    if command -v docker &>/dev/null; then
+        CONTAINER_ENGINE=docker
+    elif command -v podman &>/dev/null; then
+        CONTAINER_ENGINE=podman
     else
-    echo "ERROR: Neither 'docker-compose' or 'docker compose' were found"
+        echo "ERROR: Neither 'docker' or 'podman' were found"
+        exit 1
+    fi
+fi
+
+if command -v "${CONTAINER_ENGINE}" &>/dev/null && ${CONTAINER_ENGINE} help compose &> /dev/null; then
+    COMPOSE="${CONTAINER_ENGINE} compose"
+elif command -v "${CONTAINER_ENGINE}-compose" &> /dev/null; then
+    COMPOSE="${CONTAINER_ENGINE}-compose"
+else
+    echo "ERROR: Neither '${CONTAINER_ENGINE}-compose' or '${CONTAINER_ENGINE} compose' were found"
     exit 1
 fi
 
 check_file() {
     local file=$1
-    env $COMPOSE --file "$file" config --quiet 2>&1 \
-        | sed "/variable is not set. Defaulting/d"
+    env $COMPOSE --file "$file" config --quiet 2>&1 |
+        sed "/variable is not set. Defaulting/d"
     return "${PIPESTATUS[0]}"
 }