feat: macos and brew install support

script/install.d/20-docker.sh

@@ -1,13 +1,23 @@
 #!/usr/bin/env bash
-docker --version
 
-readonly docker_group="docker"
-if ! grep -q "$docker_group" /etc/group; then
-    echo "Adding docker group"
-    sudo groupadd "$docker_group"
-fi
+# -----------------------------------------------------------------------------
+# Description:
+#   (Ubuntu only) Configure docker.
+#
 
-if ! groups "$USER" | grep -q "\b$docker_group\b"; then
-    echo "Adding user to docker group"
-    sudo usermod -aG docker "$USER"
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+    docker --version
+
+    readonly docker_group="docker"
+    if ! grep -q "$docker_group" /etc/group; then
+        echo "Adding docker group"
+        sudo groupadd "$docker_group"
+    fi
+
+    if ! groups "$USER" | grep -q "\b$docker_group\b"; then
+        echo "Adding user to docker group"
+        sudo usermod -aG docker "$USER"
+    fi
+
+    unset docker_group
 fi