Install musl-tools to compile ring crate

ring crate is a dependency of jsonwebtoken

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

.github/workflows/pr.yml

@@ -18,6 +18,8 @@ jobs:
     - uses: actions/checkout@v3
     - name: Add musl target
       run: rustup target add x86_64-unknown-linux-musl
+    - name: Install musl-gcc
+      run: sudo apt update && sudo apt install -y musl-tools
     - name: Format Check
       run: cargo fmt --check
     - name: Build