ci(web): Add eslint and prettier CI

.github/workflows/Eslint.yml

@@ -0,0 +1,22 @@
+name: Eslint
+on:
+  workflow_call:
+    inputs:
+      subrepo:
+        required: true
+        type: string
+jobs:
+  eslint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+
+      - name: eslint
+        uses: reviewdog/action-eslint@556a3fdaf8b4201d4d74d406013386aa4f7dab96 # v1.34.0
+        with:
+          fail_level: any
+          filter_mode: nofilter
+          reporter: github-check
+          workdir: ${{ inputs.subrepo }}

.github/workflows/Handoff.yml

@@ -58,3 +58,17 @@ jobs:
     if: contains(needs.handoff.outputs.category, 'TypeScript') && contains(needs.handoff.outputs.directory, 'web')
     with:
       subrepo: web
+
+  web-eslint:
+    needs: handoff
+    uses: ./.github/workflows/Eslint.yml
+    if: contains(needs.handoff.outputs.category, 'TypeScript') && contains(needs.handoff.outputs.directory, 'web')
+    with:
+      subrepo: web
+
+  web-prettier:
+    needs: handoff
+    uses: ./.github/workflows/Prettier.yml
+    if: contains(needs.handoff.outputs.directory, 'web')
+    with:
+      subrepo: web

.github/workflows/Prettier.yml

@@ -0,0 +1,24 @@
+name: Prettier
+on:
+  workflow_call:
+    inputs:
+      subrepo:
+        required: true
+        type: string
+jobs:
+  prettier:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          fetch-depth: 0
+
+      - name: prettier
+        # TODO: Ideally we would use the upstream version, but that is broken due to not supporting fail_level
+        # https://github.com/EPMatt/reviewdog-action-prettier/issues/72 (the issue is misguided but might still be useful for trcacking)
+        uses: gcaracuel/reviewdog-action-prettier@ddacbf3caf877fd012b68601baa1903cde600bc7
+        with:
+          fail_level: any
+          filter_mode: nofilter
+          reporter: github-check
+          workdir: ${{ inputs.subrepo }}