Refactored CIs to use a matrix for cryptographic backend featuer flags.

Author: simlay

.github/workflows/test-linux-mbedtls.yml

@@ -13,10 +13,13 @@ jobs:
   build_and_test:
 
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        crypto-backend: ['crypto_openssl', 'crypto_rustcrypto', 'crypto_mbedtls']
 
     steps:
     - uses: actions/checkout@v2
     - name: Build
-      run: cd matter; cargo build --verbose --no-default-features --features crypto_openssl
+      run: cd matter; cargo build --verbose --no-default-features --features ${{matrix.crypto-backend}}
     - name: Run tests
-      run: cd matter; cargo test --verbose --no-default-features --features crypto_openssl -- --test-threads=1
+      run: cd matter; cargo test --verbose --no-default-features --features ${{matrix.crypto-backend}} -- --test-threads=1