Use composite actions in CI (#65)

* Attempt composite actions in CI

* Remove needs monero-daemon for the action

* Correct actions folder layout

* Remove empty inputs/outputs, add shell

* Try moving env declaration spot

* Remove usage of env

* Cached Rust composite action

* Replace [] with ""

Remove empty outputs

.github/actions/cached-rust/action.yml

@@ -0,0 +1,32 @@
+name: cached-rust
+description: Installs Rust, caching ~/.cargo and ./target
+
+inputs:
+  toolchain:
+    description: "Toolchain to install"
+    required: false
+    default: stable
+
+  components:
+    description: "Components to install"
+    required: false
+    default:
+
+runs:
+  using: "composite"
+  steps:
+    - name: Rust cache
+      uses: actions/cache@v3
+      with:
+        path: |
+          ~/.cargo
+          ./target
+        key: ${{ runner.os }}-${{ runner.arch }}-rust-${{ inputs.toolchain }}
+
+    - name: Install Rust
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: ${{ inputs.toolchain }}
+        profile: minimal
+        default: true
+        components: ${{ inputs.components }}