feat: proxmox idlewatcher (#88)

* feat: idle sleep for proxmox LXCs

* refactor: replace deprecated docker api types

* chore(api): remove debug task list endpoint

* refactor: move servemux to gphttp/servemux; favicon.go to v1/favicon

* refactor: introduce Pool interface, move agent_pool to agent module

* refactor: simplify api code

* feat: introduce debug api

* refactor: remove net.URL and net.CIDR types, improved unmarshal handling

* chore: update Makefile for debug build tag, update README

* chore: add gperr.Unwrap method

* feat: relative time and duration formatting

* chore: add ROOT_DIR environment variable, refactor

* migration: move homepage override and icon cache to $BASE_DIR/data, add migration code

* fix: nil dereference on marshalling service health

* fix: wait for route deletion

* chore: enhance tasks debuggability

* feat: stdout access logger and MultiWriter

* fix(agent): remove agent properly on verify error

* fix(metrics): disk exclusion logic and added corresponding tests

* chore: update schema and prettify, fix package.json and Makefile

* fix: I/O buffer not being shrunk before putting back to pool

* feat: enhanced error handling module

* chore: deps upgrade

* feat: better value formatting and handling

---------

Co-authored-by: yusing <yusing@6uo.me>

internal/net/gphttp/accesslog/multi_writer.go

@@ -0,0 +1,46 @@
+package accesslog
+
+import "strings"
+
+type MultiWriter struct {
+	writers []AccessLogIO
+}
+
+func NewMultiWriter(writers ...AccessLogIO) AccessLogIO {
+	if len(writers) == 0 {
+		return nil
+	}
+	if len(writers) == 1 {
+		return writers[0]
+	}
+	return &MultiWriter{
+		writers: writers,
+	}
+}
+
+func (w *MultiWriter) Write(p []byte) (n int, err error) {
+	for _, writer := range w.writers {
+		writer.Write(p)
+	}
+	return len(p), nil
+}
+
+func (w *MultiWriter) Lock() {
+	for _, writer := range w.writers {
+		writer.Lock()
+	}
+}
+
+func (w *MultiWriter) Unlock() {
+	for _, writer := range w.writers {
+		writer.Unlock()
+	}
+}
+
+func (w *MultiWriter) Name() string {
+	names := make([]string, len(w.writers))
+	for i, writer := range w.writers {
+		names[i] = writer.Name()
+	}
+	return strings.Join(names, ", ")
+}