ci: grep: add option to ignore grep.sh errors

Adds an option to ignore grep.sh errors in instances where there may be false
positives due to git weirdness. e.g. git not tracking renames and instead
seeing them as new packages.

Signed-off-by: Aster Boese <asterboese@mailbox.org>
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8652>

.ci/grep.sh

@@ -1,4 +1,7 @@
 #!/bin/sh -e
+
+# shellcheck shell=busybox
+
 # Description: check various bad patterns with grep
 # https://postmarketos.org/pmb-ci
 
@@ -168,6 +171,15 @@ if [ -n "$CI_MERGE_REQUEST_DIFF_BASE_SHA" ]; then
 			exit_code=1
 		fi
 	fi
+
+	# Get latest commit message in MR
+	case "$CI_COMMIT_DESCRIPTION" in
+		*"[ci:skip-grep]"*)
+			echo "WARNING: not checking packages with grep"
+			echo " ([ci:skip-grep])!"
+			exit_code=0
+			;;
+	esac
 fi
 
 exit "$exit_code"