chore: add OTA workflow

.github/workflows/release-ota.yml

@@ -0,0 +1,38 @@
+name: release-ota
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+    inputs:
+      limit:
+        description: 'Number of releases to fetch, 2 at least'
+        required: false
+        default: 21
+        type: number
+
+jobs:
+  make-ota:
+    runs-on: "ubuntu-latest"
+    steps:
+      - uses: actions/checkout@v3
+      - name: "Build OTA"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          mkdir -pv build-ota && cd build-ota
+          ../tools/OTAPacker/build.sh 'MaaAssistantArknights/MaaAssistantArknights' ${{ inputs.limit }}
+      - name: "Set tag"
+        id: set_tag
+        run: |
+          echo "release_tag=$(head -n 1 build-ota/releases)" >> $GITHUB_ENV
+      - name: "Upload to MaaRelease"
+        uses: svenstaro/upload-release-action@v2
+        with:
+          repo_name: ${{ format('{0}/{1}', github.repository_owner, 'MaaRelease') }}
+          repo_token: ${{ secrets.MAARELEASE_RELEASE }}
+          file_glob: true
+          file: build-ota/*.zip
+          tag: ${{ env.release_tag }}
+          overwrite: true
+