Add support for Linux capabilities

Implement Linux capability support for services, allowing them to run
with minimal required privileges instead of running as root. This uses
the modern IAB (Inheritable, Ambient, Bounding) API from libcap.

.github/workflows/build.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt-get -y update
-          sudo apt-get -y install pkg-config tree jq libuev-dev libite-dev
+          sudo apt-get -y install pkg-config tree jq libuev-dev libite-dev libcap-dev
       - uses: actions/checkout@v4
       - name: Static Finit
         run: |