feat: add headscale standalone compose stack

headscale.env.example

@@ -0,0 +1,20 @@
+# Headscale + Headplane versions
+HEADSCALE_VERSION=0.28.0
+HEADPLANE_VERSION=0.6.3
+
+# Public URL that Tailscale clients will use for login/coordination.
+# For final deployment, set this to the Pangolin HTTPS hostname, for example:
+# HEADSCALE_SERVER_URL=https://headscale.example.com
+# For temporary LAN-only testing, http://192.168.20.124:8080 can be used.
+HEADSCALE_SERVER_URL=https://headscale.example.com
+
+# Host ports
+HEADSCALE_HTTP_PORT=8080
+HEADPLANE_HTTP_PORT=3000
+
+# Persistent host paths on the Docker VM
+HEADSCALE_CONFIG_DIR=/opt/headscale/config
+HEADSCALE_DATA_DIR=/opt/headscale/data
+HEADPLANE_CONFIG_DIR=/opt/headplane/config
+HEADPLANE_DATA_DIR=/opt/headplane/data
+HEADPLANE_SECRETS_DIR=/opt/headplane/secrets