infra: Fix and make CI faster

.github/workflows/pages-deploy.yml

@@ -1,4 +1,3 @@
-# Based on https://gist.github.com/AndrewLester/2d3e6257d932831756226ca9a281d9b5
 name: Build and Deploy to Pages
 
 on:
@@ -66,6 +65,7 @@ jobs:
           repository: ${{ github.event.repository.full_name }}
           ref: ${{ github.head_ref }}
           token: ${{ needs.permissions-check.outputs.has-permissions == 'false' && github.token || secrets.WORKFLOW_PAT }}
+          fetch-depth: ${{ github.event_name == 'push' && 2 || 1 }}
 
       - name: 📥 Install pnpm
         uses: pnpm/action-setup@v2
@@ -118,7 +118,7 @@ jobs:
             echo "changes_detected=false >> $GITHUB_OUTPUT"
           fi
 
-      - name: ❌ Exit if Inlang config is not updated
+      - name: ❌ Exit if Inlang config is not up-to-date
         if: needs.permissions-check.outputs.has-permissions == 'false' && steps.detect-changes-inlang.outputs.changes_detected == 'true'
         run: exit 1
 
@@ -134,11 +134,33 @@ jobs:
         if: needs.permissions-check.outputs.has-permissions == 'true' && steps.auto-commit-action-inlang.outputs.changes_detected == 'true'
         run: exit 1
 
+      - name: 🔍 Get modified files
+        id: modified-files
+        uses: tj-actions/changed-files@v39
+
+      - name: 📤 Export results
+        id: changed-files
+        run: |
+          code_changes=false
+          config_changes=false
+
+          for file in ${{ steps.modified-files.outputs.all_changed_files }}; do
+            if [[ $file =~ ^src/ || $file =~ ^static/ ]]; then
+              code_changes=true
+            elif [[ $file =~ ^.*.config.*s || $file =~ ^tsconfig.json ]]; then
+              config_changes=true
+            fi
+          done
+
+          echo "code_changes=${code_changes}" >> $GITHUB_OUTPUT
+          echo "config_changes=${config_changes}" >> $GITHUB_OUTPUT
+
       - name: ✨ Check Svelte format
+        if: steps.changed-files.code_changes == 'true'
         run: pnpm check
 
       - name: ✨ Check style with Prettier & ESLint
-        id: lint-check
+        if: steps.changed-files.code_changes == 'true' || steps.changed-files.config_changes == 'true'
         run: pnpm lint
 
       - name: 🔧 Fix lint
@@ -156,42 +178,66 @@ jobs:
     runs-on: ubuntu-latest
     needs: prechecks
     if: (!failure() || github.event_name == 'push') && !cancelled()
+    outputs:
+      has-built: ${{ steps.changed-files.requires_build }}
 
     steps:
       - name: 📂 Checkout
         uses: actions/checkout@v4
         with:
           repository: ${{ github.event.repository.full_name }}
           ref: ${{ github.head_ref }}
+          fetch-depth: ${{ github.event_name == 'push' && 2 || 1 }}
+
+      - name: 🔍 Get modified files
+        id: modified-files
+        uses: tj-actions/changed-files@v39
+
+      - name: 📤 Export results
+        id: changed-files
+        run: |
+          requires_build=false
+
+          for file in ${{ steps.modified-files.outputs.all_changed_files }}; do
+            if [[ $file =~ ^src/ || $file =~ ^static/ || $file =~ ^package.json || $file =~ ^pnpm-lock.yaml || $file =~ ^.*.config.*s || $file =~ ^tsconfig.json ]]; then
+              requires_build=true
+            fi
+          done
+
+          echo "requires_build=${requires_build}" >> $GITHUB_OUTPUT
 
       - name: 🔧 Configure pages
         uses: actions/configure-pages@v3
-        if: github.event_name != 'pull_request'
+        if: github.event_name != 'pull_request' && steps.changed-files.requires_build == 'true'
         id: pages
         with:
           static_site_generator: sveltekit
 
       - name: 📥 Install pnpm
+        if: steps.changed-files.requires_build == 'true'
         uses: pnpm/action-setup@v2
         with:
           version: latest
 
       - name: 🧭 Setup Node
+        if: steps.changed-files.requires_build == 'true'
         uses: actions/setup-node@v4
         with:
           node-version: latest
           cache: pnpm
 
       - name: 📥 Install NPM dependencies
+        if: steps.changed-files.requires_build == 'true'
         run: pnpm i # no need for `--no-frozen-lockfile` here, as the sync is ensured by the `prechecks` job
 
       - name: 🔨 Build repo
+        if: steps.changed-files.requires_build == 'true'
         run: |
+          touch static/.nojekyll
           pnpm build
-          touch build/.nojekyll
 
       - name: 📤 Upload artifact
-        if: github.event_name == 'push'
+        if: github.event_name == 'push' && steps.changed-files.requires_build == 'true'
         uses: actions/upload-pages-artifact@v2
         with:
           path: build
@@ -200,7 +246,7 @@ jobs:
     name: Deploy website to GitHub Pages
     runs-on: ubuntu-latest
     needs: build
-    if: github.event_name == 'push' && !failure() && !cancelled()
+    if: github.event_name == 'push' && !failure() && !cancelled() && needs.build.outputs.has-built == 'true'
     concurrency:
       group: pages
       cancel-in-progress: true
@@ -221,10 +267,13 @@ jobs:
   perf-check:
     name: Performance checks
     runs-on: ubuntu-latest
-    needs: deploy
-    if: github.event_name == 'push' && !failure() && !cancelled()
+    needs: [build, deploy]
+    if: github.event_name == 'push' && !failure() && !cancelled() && needs.build.outputs.has-built == 'true'
 
     steps:
+      - name: 🧭 Setup Bun
+        uses: oven-sh/setup-bun@v1
+
       - name: ⚓️ Unlighthouse check
         run: |
           npm i -g @unlighthouse/cli puppeteer