Add cache workflow, not sure if it works but fullsending it.

.gitea/workflows/cache.yml

@@ -0,0 +1,31 @@
+name: Cache Rust dependencies
+on:
+  push:
+    branches:
+      - master
+jobs:
+  build:
+    runs-on: ubuntu-22.04-node
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Cache cargo registry
+      uses: actions/cache@v2
+      with:
+        path: ~/.cargo/registry
+        key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Cache cargo index
+      uses: actions/cache@v2
+      with:
+        path: ~/.cargo/git
+        key: ${{ runner.os }}-cargo-git-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Cache cargo build
+      uses: actions/cache@v2
+      with:
+        path: target
+        key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Build
+      run: cargo build -r --verbose