ci: list moved files under their old path, run the tests for chart, compose and wiki changes

The changes job listed the diff with rename detection on, so a file moved
out of an area showed up only under its new path. Moving server code or a
chart template under docs/ turned every area off and ci-ok passed on a
change that removed source from the build. The diff now runs with
--no-renames, and a test reads the exact command out of test.yml and runs
it against a scratch repository with a move in it.

The code area also missed files the test suites read from disk outside
the packages. config-templates.test.ts pins docker-compose.yml and the
Helm chart to the code defaults, help.test.ts serves wiki pages and
images, and the client's help registry test checks its links against the
wiki headings. A chart, compose or wiki change now runs the tests, and a
wiki change also builds the image, which ships wiki/ as the in-app help.
Markdown is still ignored everywhere except under wiki/.

.github/workflows/test.yml

@@ -99,7 +99,9 @@ jobs:
         run: |
           set -euo pipefail
           list="$RUNNER_TEMP/changed-files.txt"
-          changed_between() { git -c core.quotePath=false diff --name-only "$1" "$2" > "$list"; }
+          # --no-renames lists a moved file under its old path too, so a move
+          # out of an area still runs that area.
+          changed_between() { git -c core.quotePath=false diff --no-renames --name-only "$1" "$2" > "$list"; }
           case "$EVENT" in
             pull_request)
               changed_between HEAD^1 HEAD