Do not initialize data if DATABASE_URL is set (#6175)

initialize_data.sh

@@ -2,10 +2,14 @@
 # Make non-zero exit codes & other errors fatal.
 set -euo pipefail
 
-echo '-----> Running Django migrations and loading reference data'
-./manage.py migrate --noinput
-./manage.py load_initial_data
-echo '-----> Initialize SETA'
-./manage.py initialize_seta
+# Only execute if we're using the Mysql container
+if [ "${DATABASE_URL}" == "mysql://root@mysql/treeherder" ]; then
+    # Initialize migrations and SETA
+    echo '-----> Running Django migrations and loading reference data'
+    ./manage.py migrate --noinput
+    ./manage.py load_initial_data
+    echo '-----> Initialize SETA'
+    ./manage.py initialize_seta
+fi
 
 exec "$@"