devcontainer: Update Dockerfile and settings for VSCode (#2020)

* devcontainer: Update Dockerfile and configuration for GoCryptoTrader setup

* devcontainer: Update comment for clarity on format and config details

* devcontainer: Refactor post-create command to use dedicated script for tool installation

* devcontainer: Update comment for Go modernise tool for clarity

.devcontainer/docker-compose.yml

@@ -1,4 +1,3 @@
-version: '3'
 services:
   # Update this to the name of the service you want to work with in your docker-compose.yml file
   daemon:
@@ -7,7 +6,7 @@ services:
     # debugging) to execute as the user. Uncomment the next line if you want the entire 
     # container to run as this user instead. Note that, on Linux, you may need to 
     # ensure the UID and GID of the container user you create matches your local user. 
-    # See https://aka.ms/vscode-remote/containers/non-root for details.
+    # See https://code.visualstudio.com/remote/advancedcontainers/add-nonroot-user for details.
     #
     user: vscode
 
@@ -23,17 +22,23 @@ services:
     volumes:
       # Update this to wherever you want VS Code to mount the folder of your project
       - ..:/workspace:cached
-
-
+      # Persist Go module cache and build cache for faster builds
+      - gopath:/go
+      - gocache:/home/vscode/.cache/go-build
+      
       # Uncomment the next line to use Docker from inside the container. See https://aka.ms/vscode-remote/samples/docker-from-docker-compose for details.
       # - /var/run/docker.sock:/var/run/docker.sock 
 
-    # Uncomment the next four lines if you will use a ptrace-based debugger like C++, Go, and Rust.
-    #cap_add:
-    #  - SYS_PTRACE
-    #security_opt:
-    #  - seccomp:unconfined
+    # Enable ptrace for dlv/go debugging
+    cap_add:
+      - SYS_PTRACE
+    security_opt:
+      - seccomp:unconfined
 
-    # Overrides default command so things don't shut down after the process ends.
+    # Keep the container alive with a long-running process
     command: /bin/sh -c "while sleep 1000; do :; done"
- 
+
+volumes:
+  gopath:
+  gocache:
+