ci: add GIT_COMMIT_HASH build arg (#72)

This build arg is injected into the code and printed at boot up, which
is useful to know exactly what version of the code is being executed in
a container.

Signed-off-by: Travis Johnson <[email protected]>
Co-authored-by: Joe Runde <[email protected]>

Author: tjohnson31415

.github/workflows/build.yml

@@ -104,6 +104,8 @@ jobs:
         with:
           context: .
           target: server-release
+          build-args: |
+            GIT_COMMIT_HASH=${{ github.sha }}
           tags: ${{ steps.meta.outputs.tags }}
           cache-from: type=registry,ref=${{ env.CACHE_IMAGE }}
           cache-to: ${{ env.CACHE_TO }}