Added .air.conf for hot-reload support

.air.conf

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+# Config file for [Air](https://github.com/cosmtrek/air) in TOML format
+
+# Working directory
+# . or absolute path, please note that the directories following must be under root.
+root = "."
+tmp_dir = "tmp"
+
+[build]
+# Just plain old shell command. You could use `make` as well.
+cmd = "pkger; go build -o ./tmp/main cmd/headscale/headscale.go"
+# Binary file yields from `cmd`.
+bin = "tmp/headscale"
+# Customize binary.
+full_bin = "APP_ENV=dev APP_USER=air ./tmp/main"
+# Watch these filename extensions.
+include_ext = ["go", "tpl", "tmpl", "html", "js"]
+# Ignore these filename extensions or directories.
+exclude_dir = ["assets", "tmp", "vendor", "frontend/node_modules"]
+# Watch these directories if you specified.
+include_dir = []
+# Exclude files.
+exclude_file = ["pkged.go"]
+# This log file places in your tmp_dir.
+log = "air.log"
+# It's not necessary to trigger build each time file changes if it's too frequent.
+delay = 1000 # ms
+# Stop running old binary when build errors occur.
+stop_on_error = true
+# Send Interrupt signal before killing process (windows does not support this feature)
+send_interrupt = false
+# Delay after sending Interrupt signal
+kill_delay = 500 # ms
+
+[log]
+# Show log time
+time = false
+
+[color]
+# Customize each part's color. If no color found, use the raw app log.
+main = "magenta"
+watcher = "cyan"
+build = "yellow"
+runner = "green"
+
+[misc]
+# Delete tmp directory on exit
+clean_on_exit = true