Fix rust cache

Author: LMG

.github/workflows/rust.yml

@@ -13,14 +13,23 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: Swatinem/rust-cache@v1
+    - uses: actions/checkout@v2
+    # might or might not be required
+    - uses: actions-rs/toolchain@v1
+      with:
+        profile: minimal
+        toolchain: stable
     - name: Set up Python 3.x
       uses: actions/setup-python@v2
       with:
         # Semantic version range syntax or exact version of a Python version
         python-version: '3.x'
         # Optional - x64 or x86 architecture, defaults to x64
         architecture: 'x64'
+    #rustup needs to have been called before the cache action, and the cache action before the cargo commands
+    - name: Finish rust setup
+      run:  rustup target add wasm32-unknown-unknown
+    - uses: Swatinem/rust-cache@v1
     - name: Install dependencies
       run: |
         rustup target add wasm32-unknown-unknown
@@ -36,7 +45,6 @@ jobs:
         wget https://github.com/mozilla/geckodriver/releases/download/v0.29.1/geckodriver-v0.29.1-linux64.tar.gz
         tar -xf geckodriver*.tar.gz
         export PATH=$PATH:`pwd`
-    - uses: actions/checkout@v2
     - name: Check format
       run: cargo fmt -- --check
     - name: Run all unit tests