⚡️ optimize docker layer

Dockerfile.agent

@@ -12,16 +12,16 @@ RUN apk --no-cache --no-progress add \
 WORKDIR /agent
 COPY --from=binarybuilder /agent/cmd/agent/app ./app
 
-ENV HOST_PROC /agent/host/proc
-ENV HOST_SYS /agent/host/sys
-ENV HOST_ETC /agent/host/etc
-ENV HOST_VAR /agent/host/var
-ENV HOST_RUN /agent/host/run
-ENV HOST_DEV /agent/host/dev
-
-ENV DEBUG false #服务器使用IP时请设置为true
+ENV HOST_PROC=/agent/host/proc \
+    HOST_SYS=/agent/host/sys \
+    HOST_ETC=/agent/host/etc \
+    HOST_VAR=/agent/host/var \
+    HOST_RUN=/agent/host/run \
+    HOST_DEV=/agent/host/dev \
+    DEBUG=false
 
 ENV [ID, SECRET, SERVER]
 
 VOLUME ["/agent/host/proc", "/agent/host/sys", "/agent/host/etc", "/agent/host/var", "/agent/host/run", "/agent/host/dev"]
+
 CMD /agent/app -s $SERVER -i $ID -p $SECRET -d $DEBUG