api container: wait for socket

If the socket is not found, the API server will not work correctly.

api/entrypoint.sh

@@ -14,4 +14,16 @@ export CREDENTIALS_DIR="${CREDENTIALS_DIR:-/nethsecurity-api/credentials}"
 export PROMTAIL_ADDRESS="${PROMTAIL_ADDRESS:-127.0.0.1}"
 export PROMTAIL_PORT="${PROMTAIL_PORT:-9900}"
 
-exec "$@"
+socket=/etc/openvpn/run/mgmt.sock
+limit=60
+echo "Waiting for $socket to appear ..."
+while [ ! -f "$socket" ]; do
+    sleep 1
+    limit=$((limit - 1))
+    if [ "$limit" -le 0 ]; then
+        echo "Socket not found!"
+        break
+    fi
+done
+
+exec "$@"