feat: add Gitea workflow for sprite sorting and artifact management

.gitea/workflows/main.yml

@@ -0,0 +1,80 @@
+name: sorting
+on:
+  push:
+    branches: [main]
+    paths:
+      - "_sprites/**"
+      - "scripts/**"
+
+concurrency:
+  group: sorting-${{ gitea.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: write
+
+jobs:
+  run-scripts:
+    if: gitea.actor != 'gitea-actions'
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+
+      - name: setup node + npm cache
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: "npm"
+          cache-dependency-path: package-lock.json
+
+      - name: npm ci
+        run: npm ci
+
+      - name: setup python + pip cache
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+          cache: "pip"
+          cache-dependency-path: requirements.txt
+
+      - name: install python deps
+        run: pip install -r requirements.txt
+
+      - name: scripts
+        working-directory: ./scripts
+        run: |
+          rm -rf ../_sprites/unready
+          npx tsx write.ts && npx tsx sort.ts && npx tsx unready.ts
+
+      - name: commit changes
+        run: |
+          git config --local user.email "actions@gitea.local"
+          git config --local user.name "Gitea Actions"
+          git add -A .
+          # reset prevents huge artifact folders from being pushed back
+          git reset _sprites/sorted
+          git reset _sprites/sorted-merged
+          # [skip ci] prevents recursive pipeline runs
+          git commit -m "Auto-sort sprites [skip ci]" || exit 0
+          git push
+
+      - name: upload sorted
+        uses: christopherhx/gitea-upload-artifact@v4
+        with:
+          name: sorted
+          path: ./_sprites/sorted
+          retention-days: 15
+          compression-level: 0
+
+      - name: upload sorted-merged
+        uses: christopherhx/gitea-upload-artifact@v4
+        with:
+          name: sorted-merged
+          path: ./_sprites/sorted-merged
+          retention-days: 45
+          compression-level: 0
+
+      - name: cleanup
+        run: rm -rf ./_sprites/sorted ./_sprites/sorted-merged