Add basic support of devcontainer (#1280)

.devcontainer/Dockerfile

@@ -0,0 +1,14 @@
+FROM golang:1.20-bullseye
+
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends\
+        gettext-base=0.21-4 \ 
+        iptables=1.8.7-1 \
+        libgl1-mesa-dev=20.3.5-1 \
+        xorg-dev=1:7.7+22 \
+        libayatana-appindicator3-dev=0.5.5-2+deb11u2 \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+
+WORKDIR /app

.devcontainer/devcontainer.json

@@ -0,0 +1,10 @@
+{
+	"name": "NetBird",
+	"build": {
+		"context": "..",
+		"dockerfile": "Dockerfile"
+	},
+	"workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+	"capAdd": ["NET_ADMIN", "SYS_ADMIN", "SYS_RESOURCE"],
+	"privileged": true
+}