Link Check just for files in a PR (#471)

* Adding a link check that works just on the files in a given PR
* Modify the global link check to run weekly only
* Upgrade to newer version of GHA tj-actions/changed-files

Author: spier

.github/workflows/link-checker-prs.yml

@@ -0,0 +1,46 @@
+# This link check is run on all PRs but just for the files that were changed/added in the PR itself.
+# Otherwise we had it too often that PR authors would see a failing link check that had nothing to do with their PR.
+
+name: Link Check PR
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Get changed files
+        id: changed-files
+        uses: tj-actions/changed-files@v32
+
+      - name: Filter markdown files only
+        run: |
+          md_files=`find ${{ steps.changed-files.outputs.all_changed_files }} -maxdepth 0 -name "*.md"`
+          echo "MARKDOWN_FILES=$md_files" >> $GITHUB_ENV
+
+      - name: Restore lychee cache
+        uses: actions/cache@v3
+        with:
+          path: .lycheecache
+          key: cache-lychee-${{ github.sha }}
+          restore-keys: cache-lychee-
+
+      - if: ${{ env.MARKDOWN_FILES != '' }}
+        name: Link Checker
+        uses: lycheeverse/[email protected]
+        with:
+          args: --verbose --no-progress --cache --max-cache-age 1d $MARKDOWN_FILES
+          fail: true
+          jobSummary: true
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

.github/workflows/link-checker.yml

@@ -1,16 +1,14 @@
+# This link check is run on all content files once per day.
+
 # from: https://github.com/lycheeverse/lychee-action
 # link checker used is 'lychee': https://github.com/lycheeverse/lychee
 
 name: Link Check
 
 on:
-  push:
-    branches:
-      - "main"
-  pull_request:
   schedule:
     # * is a special character in YAML so you have to quote this string
-    - cron:  '30 8 * * *'
+    - cron:  '30 8 * * 5'
 
 jobs:
   linkChecker:
@@ -32,4 +30,4 @@ jobs:
           fail: true
           jobSummary: true
         env:
-          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

TRUSTED-COMMITTERS.md

@@ -57,4 +57,4 @@ However, please channel working group-specific requests through the trusted comm
 
 ## References
 
-* Our trusted committer process was inspired by [this](https://tech.europace.de/voting-in-new-trusted-committers/).
+Our trusted committer process was inspired by [this](https://tech.europace.de/voting-in-new-trusted-committers/).