Merge branch 'close-messages' into 'master'

Use custom close messages for archlinux/svntogit-{community,packages}

Closes #1

See merge request !2

close-messages.json

+{
+  "archlinux/svntogit-packages": "This project is a read-only mirror.",
+  "archlinux/svntogit-community": "This project is a read-only mirror.",
+  "default": "This project is a read-only mirror of: ${upstream_url}, please submit your work there."
+}

webhook-handler.sh

 #!/bin/bash
 set -o nounset -o errexit -o pipefail
-close_message='This project is a read-only mirror of: ${upstream_url}, please submit your work there.
-
-*This comment was generated by [${CI_PROJECT_NAME}](${CI_PROJECT_URL}).*'
 
 function curl() {
     command curl --silent \
@@ -41,6 +38,8 @@ if [[ $action = opened ]] || [[ $action = reopened ]]; then
     repository_full_name="$(jq -er .repository.full_name < "${TRIGGER_PAYLOAD}")"
 
     upstream_url="${CI_SERVER_URL}/${repository_full_name}"
+    close_message="$(jq -r --arg repository_full_name "${repository_full_name}" '.[$repository_full_name] // .["default"]' close-messages.json)"
+    close_message+=$'\n\n*This comment was generated by [${CI_PROJECT_NAME}](${CI_PROJECT_URL}).*'
     body="$(eval "echo \"${close_message}\"")"
     # https://docs.github.com/en/rest/reference/issues#create-an-issue-comment
     curl --request POST \