Revert "feat(github-actions): narrow down path scope of build action (#356)" (#357)

This reverts commit 8dde343.

Author: fhennig

template/.github/workflows/build.yml.j2

@@ -15,10 +15,6 @@ on:
     tags:
       - '[0-9][0-9].[0-9]+.[0-9]+'
   pull_request:
-    paths-ignore:
-      - 'docs/**'
-      - '.readme/**'
-      - '*.md'
   merge_group:
 
 env:
@@ -214,6 +210,34 @@ jobs:
           cache-all-crates: "true"
       - run: cargo test
 
+
+  # Similar to check_charts, this tries to render the README, and see if there are unintended changes.
+  # This will save us from merging changes to the wrong file (instead of the templated source), and from
+  # forgetting to render out modifications to the README.
+  check_readme:
+    name: Check if committed README is the one we would render from the available parts
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+        with:
+          submodules: recursive
+      - uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c # tag=v5.0.0
+        with:
+          python-version: '3.11'
+      - name: Install jinja2-cli
+        run: pip install jinja2-cli==0.8.2
+      - name: Regenerate charts
+        run: make render-readme
+      - name: Check if committed README were up to date
+        run: git diff --exit-code
+      - name: Git Diff showed uncommitted changes
+        if: ${{ failure() }}
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        with:
+          script: |
+            core.setFailed('Committed README are not up to date, please make sure to apply them to the templated partials, and re-commit!')
+
   # This job cleans up the CRDs and Helm charts, followed by rebuilding them
   # It then runs a `git diff` and fails the entire workflow, if any difference is encountered.
   #