[feature] provide empty private key function for automated builds

build/h_relay.Dockerfile

@@ -8,6 +8,11 @@ COPY go.* .
 RUN CGO_ENABLED=1 go mod download
 
 COPY . .
+
+# Private key is only used in automated testing
+COPY ./config/private_key.go.example ./config/private_key.go
+COPY ./config/test_private_key.go.example ./config/test_private_key.go
+
 RUN CGO_ENABLED=1 go build
 
 FROM alpine:3.18

config/private_key.go.example

@@ -0,0 +1,5 @@
+package config
+
+func GetPrivateKey() string {
+	return ""
+}

config/test_private_key.go.example

@@ -0,0 +1,5 @@
+package config
+
+func GetTestPrivateKey() string {
+	return ""
+}