ci: add automatic nightly builds to the Github Actions workflow (#1397)

Co-authored-by: sxyazi <sxyazi@gmail.com>

.github/workflows/cachix.yml

@@ -1,8 +1,8 @@
 name: Cachix
+
 on:
   push:
-    branches:
-      - main
+    branches: [main]
 
 jobs:
   publish:

.github/workflows/draft.yml

@@ -4,6 +4,9 @@ on:
   push:
     tags:
       - "v[0-9]+.[0-9]+.[0-9]+"
+  schedule:
+    - cron: "0 */6 * * *"
+  workflow_dispatch:
 
 jobs:
   build-unix:
@@ -145,3 +148,31 @@ jobs:
             yazi-*.zip
             yazi-*.snap
           generate_release_notes: true
+
+  nightly:
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    needs: [build-unix, build-windows, build-musl, build-snap]
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          merge-multiple: true
+
+      - run: |
+          echo 'NIGHTLY_BODY<<EOF' >> $GITHUB_ENV
+          echo "From commit: ${GITHUB_SHA:0:8}" >> $GITHUB_ENV
+          echo "Generated on: $(date -u +"%Y-%m-%d %H:%M") UTC" >> $GITHUB_ENV
+          echo "EOF" >> $GITHUB_ENV
+
+      - name: Nightly
+        uses: softprops/action-gh-release@v1
+        if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
+        with:
+          tag_name: nightly
+          prerelease: true
+          files: |
+            yazi-*.zip
+            yazi-*.snap
+          name: Nightly Build
+          body: ${{ env.NIGHTLY_BODY }}