Add commitlint job

scripts/commitlint.sh

+#!/usr/bin/env bash
+
+# store failure
+failure=false
+
+# debug output
+echo "Linting all commits between $CI_DEFAULT_BRANCH and $CI_COMMIT_REF_NAME"
+echo "--------------------------------------------------------"
+
+# loop over commit sha's for commits that exist in this branch but not the default branch
+for sha in $(git log origin/$CI_DEFAULT_BRANCH..origin/$CI_COMMIT_REF_NAME --format=format:%H); do
+  # get the commit message from the sha
+  message=$(git log --format=format:%s -n 1 $sha)
+  # debug output sha and message
+  echo "Linting commit: $sha - $message"
+  # lint message and store possible failure
+  if ! echo "$message" | npx commitlint; then failure=true; fi
+done
+
+# if we have a failure
+if $failure; then
+  # guide developer to resolution
+  echo "--------------------------------------------------------"
+  echo "You have commits that have failed linting because their content does not follow conventional standards"
+  echo "You must rebase, squash, or amend; and implement conventional standards on all commits for this branch"
+  echo "Commit standards guide - https://www.conventionalcommits.org/"
+  echo "--------------------------------------------------------"
+  echo "Quick tip - Squash commits for $CI_COMMIT_REF_NAME"
+  echo "> git checkout $CI_COMMIT_REF_NAME"
+  echo "> git reset \$(git merge-base $CI_DEFAULT_BRANCH \$(git rev-parse --abbrev-ref HEAD))"
+  echo "> git add -A"
+  echo "> git commit -m \"feat: example conventional commit\""
+  echo "> git push --force"
+  exit 1
+fi
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