build(.devcontainer.json): set zsh shell as default

Author: KaiSchwarz-cnic

.devcontainer/devcontainer.json

@@ -7,7 +7,13 @@
         "vscode": {
             "settings": {
                 "go.gopath": "/go",
-                "go.goroot": "/usr/local/go"
+                "go.goroot": "/usr/local/go",
+                "terminal.integrated.defaultProfile.linux": "zsh",
+                "terminal.integrated.profiles.linux": {
+                    "zsh": {
+                        "path": "/bin/zsh"
+                    }
+                }
             },
             "extensions": [
                 "golang.go"