Migrate to Lychee to check URLs

.github/workflows/lychee_url_checker.yml

@@ -0,0 +1,55 @@
+name: Check URLs with Lychee
+
+on:
+  push:
+    branches:
+      - main
+      - develop
+  pull_request:
+  schedule:
+    # Run everyday at 3 am UTC
+    - cron: "0 3 * * *"
+
+jobs:
+  linkChecker:
+    runs-on: ubuntu-latest
+    steps:
+
+      # cache Lychee results to avoid hitting rate limits  
+      - name: Restore lychee cache
+        uses: actions/cache@v3
+        with:
+          path: .lycheecache
+          key: cache-lychee-${{ github.sha }}
+          restore-keys: cache-lychee-
+
+      # check URLs with Lychee
+      - uses: actions/checkout@v3
+
+      # use stable version for now to avoid breaking changes
+      - name: Lychee URL checker
+        uses: lycheeverse/[email protected]
+        with:
+          # arguments with file types to check
+          args: >-
+            --cache
+            --no-progress
+            --max-cache-age 2d
+            --timeout 10
+            --max-retries 5
+            --skip-missing
+            --exclude-loopback
+            --exclude https://twitter.com/pybamm_
+            --exclude "https://doi\.org|www.sciencedirect\.com/*"
+            --accept 200,429
+            --exclude-path ./CHANGELOG.md 
+            --exclude-path ./scripts/update_version.py
+            './**/*.rst'
+            './**/*.md'
+            './**/*.py'
+            './**/*.ipynb'
+          # fail the action on broken links
+          fail: true
+        env:
+          # to be used in case rate limits are surpassed
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

.lycheeignore

@@ -0,0 +1,17 @@
+# a list of links/files to be ignored by lychee link checker (see workflow file)
+
+# Errors in docs/source/user_guide/getting_started.md
+file:///home/runner/work/PyBaMM/PyBaMM/docs/source/user_guide/api_docs
+
+# Errors in docs/source/user_guide/fundamentals/index.md
+file:///home/runner/work/PyBaMM/PyBaMM/docs/source/user_guide/fundamentals/base_battery_model
+file:///home/runner/work/PyBaMM/PyBaMM/docs/source/user_guide/fundamentals/parameter_sets
+file:///home/runner/work/PyBaMM/PyBaMM/docs/source/user_guide/fundamentals/quick_plot
+file:///home/runner/work/PyBaMM/PyBaMM/docs/source/user_guide/fundamentals/plot_voltage_components
+
+# Errors in docs/source/user_guide/index.md
+file:///home/runner/work/PyBaMM/PyBaMM/docs/source/user_guide/api_docs
+
+# Errors in examples/notebooks/README.md
+file:///home/runner/work/PyBaMM/PyBaMM/examples/notebooks/using-submodels.ipynb
+file:///home/runner/work/PyBaMM/PyBaMM/examples/notebooks/create-model.ipynb

CHANGELOG.md

@@ -11,6 +11,10 @@
 
 - Fixed `plot_voltage_components` so that the sum of overpotentials is now equal to the voltage ([#2740](https://github.com/pybamm-team/PyBaMM/pull/2740))
 
+## Optimizations
+
+- Migrated to [Lychee](https://github.com/lycheeverse/lychee-action) workflow for checking URLs [#2734](https://github.com/pybamm-team/PyBaMM/pull/2734)
+
 ## Breaking changes
 
 - Renamed "Measured open circuit voltage [V]" to "Surface open-circuit voltage [V]". This variable was calculated from surface particle concentrations, and hence "hid" the overpotential from particle gradients. The new variable "Open-circuit voltage [V]" is calculated from bulk particle concentrations instead. ([#2740](https://github.com/pybamm-team/PyBaMM/pull/2740))

CONTRIBUTING.md

@@ -400,7 +400,7 @@ Editable notebooks are made available using [Google Colab](https://colab.researc
 GitHub does some magic with particular filenames. In particular:
 
 - The first page people see when they go to [our GitHub page](https://github.com/pybamm-team/PyBaMM) displays the contents of [README.md](README.md), which is written in the [Markdown](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet) format. Some guidelines can be found [here](https://help.github.com/articles/about-readmes/).
-- The license for using PyBaMM is stored in [LICENSE](LICENSE), and [automatically](https://help.github.com/articles/adding-a-license-to-a-repository/) linked to by GitHub.
+- The license for using PyBaMM is stored in [LICENSE](LICENSE.txt), and [automatically](https://help.github.com/articles/adding-a-license-to-a-repository/) linked to by GitHub.
 - This file, [CONTRIBUTING.md](CONTRIBUTING.md) is recognised as the contribution guidelines and a link is [automatically](https://github.com/blog/1184-contributing-guidelines) displayed when new issues or pull requests are created.
 
 ## Acknowledgements