Fix mac arm64 build (#108)

* Add build-args input

* Updated Dockerfile for broker service

Removed TARGETOS argument and its usage from the Dockerfile. This simplifies the build process by not specifying the operating system during dotnet publish command execution.

.github/actions/build-docker/action.yml

@@ -11,6 +11,8 @@ inputs:
   push:
     description: Push the resulting image.
     default: 'false'
+  build-args:
+    description: Optional build arguments to provide.
   token:
     description: The GITHUB_TOKEN to use for pushing to ghcr.io.
     required: true
@@ -51,6 +53,7 @@ runs:
     - uses: docker/build-push-action@v5
       with:
         file: ${{ inputs.file }}
+        build-args: ${{ inputs.build-args }}
         provenance: true
         sbom: true
         platforms: linux/amd64,linux/arm64

docker/broker/Dockerfile

@@ -2,7 +2,6 @@
 FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/sdk:9.0.100-preview.4 AS base
 ARG BUILDPLATFORM
 ARG TARGETARCH
-ARG TARGETOS
 
 FROM --platform=$BUILDPLATFORM base AS build
 WORKDIR /build
@@ -23,7 +22,6 @@ COPY src/Broker/ ./Broker/
 RUN MINVERDISABLE=true \
 	dotnet publish \
 		--no-restore \
-		--os $TARGETOS \
 		--arch $TARGETARCH \
 		--configuration Release \
 		--output /out \