ci/request-reviews: Request reviews for individual team members

This makes this codeowner mechanism behave differently than the native
one, but there's no other way to avoid rerequesting reviews from teams
when a member already reviewed the PR.

(cherry picked from commit 1ff83b2c96)

ci/request-reviews/get-reviewers.sh

@@ -34,8 +34,8 @@ log "This PR touches ${#touchedFiles[@]} files"
 # remove code owners to avoid pinging them
 git -C "$gitRepo" show "$baseRef":"$ownersFile" > "$tmp"/codeowners
 
-# Associative arrays with the team/user as the key for easy deduplication
-declare -A teams users
+# Associative array with the user as the key for easy de-duplication
+declare -A users=()
 
 for file in "${touchedFiles[@]}"; do
     result=$(codeowners --file "$tmp"/codeowners "$file")
@@ -61,10 +61,34 @@ for file in "${touchedFiles[@]}"; do
         fi
         # The first regex match is everything after the @
         entry=${BASH_REMATCH[1]}
-        if [[ "$entry" =~ .*/(.*) ]]; then
-            # Teams look like $org/$team, where we only need $team for the API
-            # call to request reviews from teams
-            teams[${BASH_REMATCH[1]}]=
+
+        if [[ "$entry" =~ (.*)/(.*) ]]; then
+            # Teams look like $org/$team
+            org=${BASH_REMATCH[1]}
+            team=${BASH_REMATCH[2]}
+
+            # Instead of requesting a review from the team itself,
+            # we request reviews from the individual users.
+            # This is because once somebody from a team reviewed the PR,
+            # the API doesn't expose that the team was already requested for a review,
+            # so we wouldn't be able to avoid rerequesting reviews
+            # without saving some some extra state somewhere
+
+            # We could also consider implementing a more advanced heuristic
+            # in the future that e.g. only pings one team member,
+            # but escalates to somebody else if that member doesn't respond in time.
+            gh api \
+                --cache=1h \
+                -H "Accept: application/vnd.github+json" \
+                -H "X-GitHub-Api-Version: 2022-11-28" \
+                "/orgs/$org/teams/$team/members" \
+                --jq '.[].login' > "$tmp/team-members"
+            readarray -t members < "$tmp/team-members"
+            log "Team $entry has these members: ${members[*]}"
+
+            for user in "${members[@]}"; do
+                users[$user]=
+            done
         else
             # Everything else is a user
             users[$entry]=
@@ -96,8 +120,6 @@ done < "$tmp/already-reviewed-by"
 # Turn it into a JSON for the GitHub API call to request PR reviewers
 jq -n \
     --arg users "${!users[*]}" \
-    --arg teams "${!teams[*]}" \
     '{
       reviewers: $users | split(" "),
-      team_reviewers: $teams | split(" ")
     }'