[CI] Refactor publish_draft_release.sh (#1289)

* Refactor publish_draft_release.sh

* Switch to using arrays for storing labelled changes
* Combine changes for Polkadot and Substrate
* Change sanitised_git_logs in `lib.sh` to drop `*`s at the start
* Only look for priorities of medium or above (presence of one or more
  C1 label is enforeced by check-labels anyway, saves us some API calls)

* Ensure priorities >C1-low aren't labelled B0-silent

polkadot/scripts/gitlab/check_labels.sh

@@ -3,9 +3,11 @@
 #shellcheck source=lib.sh
 source "$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )/lib.sh"
 
+repo='paritytech/polkadot'
+
 ensure_labels() {
   for label in "$@"; do
-    if has_label 'paritytech/polkadot' "$CI_COMMIT_BRANCH" "$label"; then
+    if has_label "$repo" "$CI_COMMIT_BRANCH" "$label"; then
       return 0
     fi
   done
@@ -19,7 +21,7 @@ releasenotes_labels=(
   'B2-runtimenoteworthy'
 )
 
-criticality_labels=(
+priority_labels=(
   'C1-low'
   'C3-medium'
   'C7-high'
@@ -34,11 +36,19 @@ else
   exit 1
 fi
 
-echo "[+] Checking release criticality (C) labels for $CI_COMMIT_BRANCH"
-if ensure_labels "${criticality_labels[@]}";  then
-  echo "[+] Release criticality label detected. All is well."
+echo "[+] Checking release priority (C) labels for $CI_COMMIT_BRANCH"
+if ensure_labels "${priority_labels[@]}";  then
+  echo "[+] Release priority label detected. All is well."
 else
-  echo "[!] Release criticality label not detected. Please add one of: ${criticality_labels[*]}"
+  echo "[!] Release priority label not detected. Please add one of: ${priority_labels[*]}"
+  exit 1
+fi
+
+# If the priority is anything other than C1-low, we *must not* have a B0-silent
+# label
+if has_label "$repo" "$CI_COMMIT_BRANCH" 'B0-silent' &&
+  ! has_label "$repo" "$CI_COMMIT_BRANCH" 'C1-low' ; then
+  echo "[!] Changes with a priority higher than C1-low *MUST* have a B- label that is not B0-Silent"
   exit 1
 fi