feat: cross-compile target binaries

- Avoid stripping cross-compiled binaries
- Disable UPX and dart-protobuf for arm64
- Use `gcompat`
- Maximize caching possibilities
- Install grpc, protoc, protobuf-c and dart-protobuf from package repos
- Few minor fixes/styling improvements

.github/workflows/dockerimage.yml

@@ -65,20 +65,16 @@ jobs:
         platforms: linux/amd64,linux/arm64
         build-args: |
           ALPINE_VERSION=${{ env.ALPINE_VERSION }}
-          DART_PROTOBUF_VERSION=${{ env.DART_PROTOBUF_VERSION }}
           DART_VERSION=${{ env.DART_VERSION }}
           GO_VERSION=${{ env.GO_VERSION }}
           GOOGLE_API_VERSION=${{ env.GOOGLE_API_VERSION }}
           GOTEMPLATE_VERSION=${{ env.GOTEMPLATE_VERSION }}
           GRPC_GATEWAY_VERSION=${{ env.GRPC_GATEWAY_VERSION }}
-          GRPC_JAVA_VERSION=${{ env.GRPC_JAVA_VERSION }}
           GRPC_RUST_VERSION=${{ env.GRPC_RUST_VERSION }}
           GRPC_SWIFT_VERSION=${{ env.GRPC_SWIFT_VERSION }}
-          GRPC_VERSION=${{ env.GRPC_VERSION }}
           GRPC_WEB_VERSION=${{ env.GRPC_WEB_VERSION }}
           JSONSCHEMA_VERSION=${{ env.JSONSCHEMA_VERSION }}
           NODE_VERSION=${{ env.NODE_VERSION }}
-          PROTOBUF_C_VERSION=${{ env.PROTOBUF_C_VERSION }}
           PROTOC_GEN_DOC_VERSION=${{ env.PROTOC_GEN_DOC_VERSION }}
           PROTOC_GEN_GO_GRPC_VERSION=${{ env.PROTOC_GEN_GO_GRPC_VERSION }}
           PROTOC_GEN_GO_VERSION=${{ env.PROTOC_GEN_GO_VERSION }}