ci: refactor GitHub Actions workflow file (#1249)

* Clean up the workflow file

This removes the trailing whitespace from the workflow, removes an
unused step and fixes up some yaml formatting.

* Make the caching more aggressive

This makes the caching more aggressive by allowing for partial
restoration of the cached data and use the cache for more jobs.

* Run all the tests in parallel

Have stopped the testsuites from requiring the compile checks, Github
Actions doesn't mind that we are running multiple tests in parallel and
this does over a bit of a speed up.

* Separate Security Audit into a separate workflow

Have moved the Cargo Audit check into it's own workflow and switched it
to use the `actions-rs/audit-check` to simplify the setup. Have also
added in a daily security scan.

.github/workflows/security_audit.yml

@@ -0,0 +1,29 @@
+---
+name: Security audit
+on:
+  push:
+    paths:
+      - '**/Cargo.toml'
+      - '**/Cargo.lock'
+jobs:
+  security_audit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/audit-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+---
+name: Security audit [Daily]
+on:
+  schedule:
+    - cron: '0 0 * * *'
+jobs:
+  security_audit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/audit-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/workflow.yml

@@ -1,3 +1,4 @@
+---
 name: Main workflow
 on:
   push:
@@ -22,7 +23,6 @@ jobs:
           toolchain: stable
           components: rustfmt
           override: true
-      - run: rustup component add rustfmt
       - uses: actions-rs/cargo@v1
         with:
           command: fmt
@@ -45,28 +45,33 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
           args: --all-targets --all-features -- -D clippy::all
 
-  # Run a security audit on dependencies
-  cargo_audit:
-    name: Cargo Audit [Security]
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-          override: true
-      - run: cargo install --force cargo-audit
-      - run: cargo generate-lockfile
-      - uses: actions-rs/cargo@v1
-        with:
-          command: audit
-
   # Ensure that the project could be successfully compiled
   cargo_check:
     name: Compile
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+
+      - name: Cache cargo registry
+        uses: actions/cache@v1
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-registry-
+      - name: Cache cargo index
+        uses: actions/cache@v1
+        with:
+          path: ~/.cargo/git
+          key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-index-
+      - name: Cache cargo build
+        uses: actions/cache@v1
+        with:
+          path: target
+          key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
@@ -81,7 +86,6 @@ jobs:
   # On both Rust stable and Rust nightly
   test:
     name: Test Suite
-    needs: [cargo_check]
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -98,11 +102,15 @@ jobs:
         with:
           path: ~/.cargo/registry
           key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-registry-
       - name: Cache cargo index
         uses: actions/cache@v1
         with:
           path: ~/.cargo/git
           key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-index-
       - name: Cache cargo build
         uses: actions/cache@v1
         with:
@@ -212,6 +220,21 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
+      - name: Cache cargo registry
+        uses: actions/cache@v1
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-registry-
+      - name: Cache cargo index
+        uses: actions/cache@v1
+        with:
+          path: ~/.cargo/git
+          key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-index-
+
       - name: Install Rust toolchain
         uses: actions-rs/toolchain@v1
         with: