added hot-update action

Author: cppHusky

.github/workflows/hot-update.yaml

@@ -0,0 +1,21 @@
+name: Hot Update
+on:
+  push:
+    branches:
+      - master
+jobs:
+  hot-update:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Update font dependencies
+        run: |
+          git submodule init
+          git submodule update
+          cd fonts
+          git submodule init
+          git submodule update
+      - name: Compile main.pdf
+        run: make main.pdf
+      - name: Release
+        run: gh release upload hot-update main.pdf