cloudevents#9 Encoders for MQTT

Signed-off-by: Subhobrata Dey <[email protected]>

Author: sbcd90

.github/workflows/rust_tests.yml

@@ -28,7 +28,7 @@ jobs:
     # Setup musl if needed
     - run: sudo apt-get update
       if: matrix.target == 'x86_64-unknown-linux-musl'
-    - run: sudo apt-get install -y musl musl-dev musl-tools cmake libssl-dev
+    - run: sudo apt-get install -y musl musl-dev musl-tools cmake libssl-dev pkg-config
       if: matrix.target == 'x86_64-unknown-linux-musl'
 
     # Caching stuff