Introduce lychee link checker (instead of liche) (#436)

Introduce lychee link checker (to fix issues with rate limiting on checks of github links with old liche link checker).
Uses a more explicit link ignore list in `.lycheeignore` which is easier to understand.

Adding some badges for this GHA and others to the README (for fun).
Also giving this GHA a simpler name: Link Check

Author: spier

.github/workflows/link-checker.yml

@@ -1,7 +1,7 @@
-# from: https://github.com/marketplace/actions/link-checker
-# link checker used is 'liche': https://github.com/raviqqe/liche
+# from: https://github.com/lycheeverse/lychee-action
+# link checker used is 'lychee': https://github.com/lycheeverse/lychee
 
-name: Link Check on Patterns and README
+name: Link Check
 
 on:
   push:
@@ -16,11 +16,20 @@ jobs:
   linkChecker:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - name: Link Checker
-      id: lc
-      uses: peter-evans/link-checker@v1
-      with:
-        args: -v -d . -x "http://creativecommons.org/licenses|https://isc-inviter.herokuapp.com|https://github.com/rcs/rcs-viewer/pull/81|fearlesschangepatterns.com|https://ulir.ul.ie/bitstream/handle/10344/4443/Stol_2014_inner.pdf|https://docs.github.com/en/rest/metrics/statistics|https://docs.github.com/en/rest/search#search-repositories" README.md patterns/ book/ translation/ -r
-    - name: Fail if there were link errors
-      run: exit ${{ steps.lc.outputs.exit_code }}
+      - uses: actions/checkout@v3
+
+      - name: Restore lychee cache
+        uses: actions/cache@v3
+        with:
+          path: .lycheecache
+          key: cache-lychee-${{ github.sha }}
+          restore-keys: cache-lychee-
+
+      - name: Link Checker
+        uses: lycheeverse/lychee-action@v1.5.0
+        with:
+          args: --verbose --no-progress --cache --max-cache-age 1d README.md patterns/ book/ translation/
+          fail: true
+          jobSummary: true
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

.lycheeignore

@@ -0,0 +1,9 @@
+# These links are ignored by our link checker https://github.com/lycheeverse/lychee
+# The file allows you to list multiple regular expressions for exclusion (one pattern per line).
+https://example.com/link/to/your/trusted/committer/documentation.md
+https://github.com/rcs/rcs-viewer/pull/81
+http://creativecommons.org/licenses
+https://isc-inviter.herokuapp.com
+fearlesschangepatterns.com
+https://ulir.ul.ie/bitstream/handle/10344/4443/Stol_2014_inner.pdf
+.*@andrew.clegg.*

README.md

@@ -1,3 +1,6 @@
+[![Check Links](https://github.com/InnerSourceCommons/InnerSourcePatterns/actions/workflows/link-checker.yml/badge.svg)](https://github.com/InnerSourceCommons/InnerSourcePatterns/actions/workflows/link-checker.yml)
+[![Pattern Syntax Validation](https://github.com/InnerSourceCommons/InnerSourcePatterns/actions/workflows/lint-patterns.yml/badge.svg)](https://github.com/InnerSourceCommons/InnerSourcePatterns/actions/workflows/lint-patterns.yml)
+
 # InnerSource Patterns
 
 <a href="https://patterns.innersourcecommons.org">