Store build cache on push to main, else read-only

.github/workflows/cargo_build_cache.yml

@@ -0,0 +1,29 @@
+name: Store cargo build cache
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'smart-contracts/**.rs'
+      - 'smart-contracts/**.toml'
+  workflow_dispatch:
+
+jobs:
+  store-build-cache:
+    - name: Check out repository code
+      uses: actions/checkout@v3
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@stable
+    - name: Rust check
+      run: cargo check
+      working-directory: smart-contracts
+    - name: Store dependencies
+      uses: actions/cache/save@v4
+      with:
+        path: |
+          ~/.cargo
+          ~/go
+          **/target
+        key: ${{ runner.os }}-cargo-$GITHUB_SHA
+        restore-keys: ${{ runner.os }}-cargo

.github/workflows/cl_vault.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
       - name: Restore dependencies
-        uses: actions/cache@v4
+        uses: actions/cache/restore@v4
         with:
           path: |
             ~/.cargo

.github/workflows/rust_basic.yml

@@ -24,7 +24,7 @@ jobs:
         uses: dtolnay/rust-toolchain@stable
       - name: Restore dependencies
         if: env.GIT_DIFF
-        uses: actions/cache@v4
+        uses: actions/cache/restore@v4
         with:
           path: |
             ~/.cargo

.github/workflows/rust_test_tube.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
       - name: Restore dependencies
-        uses: actions/cache@v4
+        uses: actions/cache/restore@v4
         with:
           path: |
             ~/.cargo