feat: add lefthook, megalinter and update editorconfig (#270)

This change adds [LeftHook](https://lefthook.dev/) as a GitHub hook management tool alongside [MegaLinter](https://megalinter.io/) to lint all relevant files within the repository.

For users that don't end up installing LeftHook for pre-commit hooks, megalinter picks up the necessary formatting changes and reports them.

* feat: add lefthook, megalinter and update editorconfig
* fix: lint commit ordering
* refactor: adjust megalinter reporters
* refactor: adjust description for cache domains
* refactor: single - for passing options
* refactor: add repo-specific fmt in megalinter pre-commands too

.mega-linter.yml

@@ -0,0 +1,39 @@
+# Configuration file for MegaLinter
+#
+# See all available variables at https://megalinter.io/latest/config-file/ and in
+# linters documentation
+
+APPLY_FIXES: all
+FLAVOR_SUGGESTIONS: false
+PRINT_ALPACA: false
+SHOW_ELAPSED_TIME: true
+
+ENABLE:
+  - ACTION
+  - BASH
+  - EDITORCONFIG
+  - JSON
+  - MARKDOWN
+  - SPELL
+  - YAML
+
+DISABLE_LINTERS:
+  - JSON_V8R
+  - MARKDOWN_MARKDOWNLINT
+  - SPELL_CSPELL
+  - YAML_V8R
+
+PRE_COMMANDS:
+  - command: apk add --no-cache yq
+    cwd: root
+  - command: yq -i ".cache_domains |= sort_by(.name)" cache_domains.json
+    cwd: workspace
+  - command: |
+      for f in *.txt; do
+        sort -uo ${f} ${f}
+      done
+    cwd: workspace
+
+POST_COMMANDS:
+  - command: find . -user root -group root -exec chown ${USER}:${GROUP} {} \;
+    cwd: workspace