Enhance Rust CI workflow with caching and checks

Updated the GitHub Actions workflow to include caching for cargo registry and build steps, added format check, Clippy analysis, and security audit steps. Removed redundant steps and reorganized the workflow for better efficiency.

.github/workflows/rust.yml

@@ -1,13 +1,14 @@
 name: BuildTests
+
 permissions:
   contents: read
   pull-requests: write
 
 on:
   push:
-    branches: [ "main" ]
+    branches: ["main"]
   pull_request:
-    branches: [ "main" ]
+    branches: ["main"]
 
 env:
   CARGO_TERM_COLOR: always
@@ -16,42 +17,67 @@ jobs:
   build-library:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
-    - name: Build library
-      run: |
-        cd boxy-cli
-        cargo build --verbose
-    - name: Test library
-      run: |
-        cd boxy-cli
-        cargo test --verbose
+      - uses: actions/checkout@v6
+
+      - name: Cache cargo registry and build
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: boxy-cli
+
+      - name: Build library
+        run: |
+          cd boxy-cli
+          cargo build --verbose
+
+      - name: Test library
+        run: |
+          cd boxy-cli
+          cargo test --verbose
+
+      - name: Format check
+        run: |
+          cd boxy-cli
+          cargo fmt --check
+
+      - name: Clippy
+        run: |
+          cd boxy-cli
+          cargo clippy -- -D warnings
+
+      - name: Security audit
+        run: |
+          cargo install cargo-audit --quiet
+          cd boxy-cli
+          cargo audit
 
   build-binary:
     needs: build-library
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
-    - name: Build binary tests
-      run: |
-        cd binary-testing
-        cargo build --verbose
+      - uses: actions/checkout@v6
+
+      - name: Cache cargo registry and build
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: binary-testing
+
+      - name: Build and run binary tests
+        run: |
+          cd binary-testing
+          cargo test --verbose
 
-  test-binary:
-    needs: build-binary
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v6
-    - name: Run binary tests
-      run: |
-        cd binary-testing
-        cargo test --verbose
-  
   test-docs:
     needs: build-library
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v6
-    - name: Compile Docs
-      run: |
-        cd boxy-cli
-        cargo doc
+      - uses: actions/checkout@v6
+
+      - name: Cache cargo registry
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: boxy-cli
+
+      - name: Compile docs
+        run: |
+          cd boxy-cli
+          cargo doc --no-deps