chore(make): add a clean target

Removes the artifacts that are produced by the other targets and ignored by git, so a broken state can be reset without
remembering which directories are generated. `helm dependency build` populates `charts`, the readme generator installs
`node_modules` and packaging leaves the chart archive and its signature behind.

Co-authored-by: Copilot <copilot@github.com>

.gitea/workflows/helm.yaml

@@ -18,6 +18,8 @@ jobs:
     - uses: azure/setup-helm@9bc31f4ebc9c6b171d7bfbaa5d006ae7abdb4310 # v5.0.1
       with:
         version: v4.3.0 # renovate: datasource=github-releases depName=helm/helm
+    - name: Build helm dependencies
+      run: helm dependency build
     - name: Lint helm files
       run: |
         helm lint --values values.yaml .
@@ -33,5 +35,7 @@ jobs:
         HELM_UNITTEST_VERSION: v1.0.0 #renovate: datasource=github-releases depName=helm-unittest/helm-unittest
       name: Install helm-unittest
       run: helm plugin install --verify=false --version "${HELM_UNITTEST_VERSION}" https://github.com/helm-unittest/helm-unittest
+    - name: Build helm dependencies
+      run: helm dependency build
     - name: Execute helm unittests
       run: helm unittest --strict --file 'unittests/**/*.yaml' .

Makefile

@@ -1,5 +1,11 @@
 SHELL := /usr/bin/env bash -O globstar
 
+# CLEAN
+# ==============================================================================
+PHONY+=clean
+clean:
+	-rm -rf charts *.tar.gz *.tar.gz.sig node_modules
+
 # MISSING DOT
 # ==============================================================================
 PHONY+=missing-dot