Maintenance: Activate ShellCheck also for 'function' files without '.sh' extension.

.gitlab/ci/pre.yml

@@ -19,7 +19,7 @@ shellcheck:
   before_script:
     - echo "Disable default before_script."
   script:
-    - shellcheck -S warning $(find . -name "*.sh" | grep -v "/vendor/")
+    - shellcheck -S warning $(find . -name "*.sh" -o -name "functions" | grep -v "/vendor/")
 
 coffeelint:
   <<: *template_pre

contrib/backup/functions

@@ -50,7 +50,8 @@ function backup_files () {
 }
 
 function create_pgpassfile() {
-  export PGPASSFILE=$(mktemp)
+  PGPASSFILE=$(mktemp)
+  export PGPASSFILE
     chmod 600 "$PGPASSFILE"
     cat <<EOT > "$PGPASSFILE"
 *:*:${DB_NAME}:${DB_USER}:${DB_PASS}