ci(docs): Fail when build aborts from broken links (#2266)

Using `set -ex` will exit the script as soon as a non-zero exit code is returned, such as when the docker image fails building the docs due to `build --strict` catching broken links. This also removes the need for `|| exit` when changing directory.

This seems fine for a small script, but AFAIK an alternative fix is just adding `|| exit` to the end of the `docker run` command too? There appears to be advice [against adopting `-e` carelessly](http://mywiki.wooledge.org/BashFAQ/105), while others [encourage `-e`](http://redsymbol.net/articles/unofficial-bash-strict-mode/). I know that several maintainers here have preference towards `set -e` so I've kept the original PR solution.

Additionally:

- `-x` is used to improve command visibility when reviewing the workflow log output.
- `--name` isn't necessary, but was part of the original PR.
- I've chosen not to include `-o pipefail`, only because no pipes are used in this script.

* docs(fix): Fix broken links

* ci(docs): Added inline docs

Extra documentation context for maintainers to quickly grok what's going on.

* chore(docs): Minor typo fix by wernerfred

Added from their related PR by request.

.github/workflows/scripts/docs/build-docs.sh

@@ -1,15 +1,20 @@
 #!/bin/bash
+set -ex
 
+# PWD should be at the project docs/ folder.
 # `--user` is required for build output file ownership to match the CI user,
 #  instead of the internal root user of the container.
+# `build --strict` ensures the build fails when any warnings are omitted.
 docker run \
   --rm \
   --user "$(id -u):$(id -g)" \
-  -v "${PWD}:/docs" \
+  --volume "${PWD}:/docs" \
+  --name "build-docs" \
   squidfunk/mkdocs-material:7.3.5 build --strict
 
 # Remove unnecessary build artifacts: https://github.com/squidfunk/mkdocs-material/issues/2519
-cd site || exit
+# site/ is the build output folder.
+cd site
 find . -type f -name '*.min.js.map' -delete -o -name '*.min.css.map' -delete
 rm sitemap.xml.gz
 rm assets/images/favicon.png

docs/content/config/environment.md

@@ -721,8 +721,8 @@ you to replace both instead of just the envelope sender.
 - password for default relay user
 
 [docs-faq-onedir]: ../faq.md#what-is-the-mail-state-folder-for
-[docs-tls]: ./config/security/ssl.md
+[docs-tls]: ./security/ssl.md
 [docs-tls-letsencrypt]: ./security/ssl.md#lets-encrypt-recommended
 [docs-tls-manual]: ./security/ssl.md#bring-your-own-certificates
 [docs-tls-selfsigned]: ./security/ssl.md#self-signed-certificates
-[docs-accounts]: ./config/user-management/accounts.md#notes
+[docs-accounts]: ./user-management/accounts.md#notes

docs/content/config/user-management/accounts.md

@@ -41,7 +41,7 @@ You will then be asked for a password, and be given back the data for a new acco
 
 - `imap-quota` is enabled and allow clients to query their mailbox usage.
 - When the mailbox is deleted, the quota directive is deleted as well.
-- Dovecot quotas support LDAP, **but it's not implemented** (_PR are welcome!_).
+- Dovecot quotas support LDAP, **but it's not implemented** (_PRs are welcome!_).
 
 [docs-setupsh]: ../setup.sh.md
 [github-issue-552]: https://github.com/docker-mailserver/docker-mailserver/issues/552

docs/content/examples/tutorials/basic-installation.md

@@ -144,8 +144,8 @@ In this setup `docker-mailserver` is not intended to receive email externally, s
 [docs-ports]: ../../config/security/understanding-the-ports.md
 [docs-setup-script]: ../../config/setup.sh.md
 [docs-environment]: ../../config/environment.md
-[docs-spf]: ../../config/best-practice/spf.md
-[docs-dkim]: ../../config/best-practice/dkim.md
+[docs-spf]: ../../config/best-practices/spf.md
+[docs-dkim]: ../../config/best-practices/dkim.md
 [docs-ssl]: ../../config/security/ssl.md#lets-encrypt-recommended
 
 [github-issue-1405-comment]: https://github.com/docker-mailserver/docker-mailserver/issues/1405#issuecomment-590106498

docs/content/examples/uses-cases/forward-only-mailserver-with-ldap-authentication.md

@@ -108,5 +108,5 @@ You see that besides `query_filter`, I had to customize as well `result_attribut
 
     One user reports only having success if `ENABLE_LDAP=0` was set.
 
-[docs-userpatches]: ./config/advanced/override-defaults/user-patches.md
+[docs-userpatches]: ../../config/advanced/override-defaults/user-patches.md
 [github-issue-1247]: https://github.com/docker-mailserver/docker-mailserver/issues/1247