Add healthcheck

Dockerfile

@@ -9,15 +9,20 @@ COPY . .
 RUN CGO_ENABLED=0 GOOS=${GOOS} GOARCH=${GOARCH} go build -ldflags="-s -w" -o zurg cmd/zurg/main.go
 
 # Obfuscation stage
-# FROM alpine:3 AS obfuscator
-# WORKDIR /app
-# COPY --from=builder /app/zurg .
-# RUN apk add --no-cache upx
-# RUN upx --brute zurg
+FROM alpine:3 AS obfuscator
+WORKDIR /app
+COPY --from=builder /app/zurg .
+RUN apk add --no-cache upx
+RUN upx --brute zurg
 
 # Final stage
 FROM alpine:3
 WORKDIR /app
-COPY --from=builder /app/zurg .
+COPY --from=obfuscator /app/zurg .
 RUN apk add --no-cache fuse3
+
+# Healthcheck to verify that port 9999 is available to accept connections
+HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
+  CMD nc -z localhost 9999 || exit 1
+
 ENTRYPOINT ["./zurg"]