tools/static-checks: Install clang

Without this library the builds are failing with the following error:

```
...
error: failed to run custom build command for `devicemapper-sys v0.1.5`

Caused by: process didn't exit successfully:
    `/kata-containers/src/agent/target/release/build/devicemapper-sys-d8eae524a127e049/build-script-build`
    (exit status: 101) --- stderr thread 'main' panicked at 'Unable to
    find libclang: "couldn't find any valid shared libraries matching:
    ['libclang.so', 'libclang-*.so', 'libclang.so.*', 'libclang-*.so.*'],
    set the `LIBCLANG_PATH` environment variable to a path where one of
    these files can be found (invalid: [])"',
    /root/.cargo/registry/src/github.com-1ecc6299db9ec823/bindgen-0.63.0/./lib.rs:2338:31
```

Fixes: #7580

Signed-off-by: Suraj Deshmukh <suraj.deshmukh@microsoft.com>

.github/workflows/static-checks.yaml

@@ -42,7 +42,8 @@ jobs:
         sudo apt-get install -y --no-install-recommends \
           build-essential \
           haveged \
-          libdevmapper-dev
+          libdevmapper-dev \
+          clang
     - name: Install Go
       uses: actions/setup-go@v3
       with:

tools/osbuilder/rootfs-builder/ubuntu/Dockerfile.in

@@ -47,7 +47,8 @@ RUN apt-get update && \
     protobuf-compiler \
     gettext-base \
     umoci \ 
-    kmod
+    kmod \
+    clang
 
 # aarch64 requires this name -- link for all
 RUN ln -s /usr/bin/musl-gcc "/usr/bin/$(uname -m)-linux-musl-gcc"