ci(devcontainer): improve boot time

Run postunpack.sh in postCreateCommand hook,
which can continue running in the background and in parallel
to `npm ci --no-audit` when VSCode
is already connected to the devcontainer.

The time it takes for the container to be fully ready it's the same
but the time to start coding will be much lower.

.devcontainer/devcontainer.json

@@ -17,8 +17,11 @@
       "onAutoForward": "notify"
     }
   },
-  "onCreateCommand": ".devcontainer/postunpack.sh",
-  "postCreateCommand": "npm ci --no-audit",
+  "onCreateCommand": "apt update -qq && apt install -y --no-install-recommends jq",
+  "postCreateCommand": {
+    "npm": "npm ci --no-audit",
+    "postunpack": ".devcontainer/postunpack.sh"
+  },
   "postAttachCommand": "cat .vscode/extensions.json | jq -r .recommendations[] | xargs -n 1 code --install-extension",
   "hostRequirements": { "cpus": 4, "memory": "8gb" }
 }

.devcontainer/postunpack.sh

@@ -3,7 +3,7 @@ unset YARN_VERSION && rm -rf /opt/yarn*
 rm -rf /bin/sh && ln -s /bin/bash /bin/sh
 git config --global core.editor 'code --wait'
 
-## Install dependencies
-apt update -qq
-apt install -y --no-install-recommends jq $(cat packaging/tauri/apt_packages)
+## Install Tauri dependencies
+apt install -y --no-install-recommends $(cat packaging/tauri/apt_packages)
 rm -rf /var/lib/apt/lists /var/cache/apt/archives
+