ci: fix linter errors: find-container.sh

scripts/find-container.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -e
 
-if [[ ! -z "$NEXTCLOUD_PROJECT_NAME" ]]; then
+if [[ -n "$NEXTCLOUD_PROJECT_NAME" ]]; then
     containerName="${NEXTCLOUD_PROJECT_NAME}[_-]"
     matchEnd="[\._-]\d+"
 else
@@ -12,6 +12,6 @@ containerName="${containerName}${NEXTCLOUD_CONTAINER_NAME}"
 
 # Get the ID of the first matching container so we can exec something in it later
 docker ps --format '{{.Names}},{{.ID}}' | \
-    egrep "^${containerName}${matchEnd}" | \
+    grep -E "^${containerName}${matchEnd}" | \
     awk '{split($0,a,","); print a[2]}' | \
     head -n 1