chore: configure docker during startup instead of during image building

The reason for this change is that /etc/resolv.conf is reset when the
container is started, so the DNS configuration is lost.

.devcontainer.json

@@ -4,7 +4,9 @@
   "onCreateCommand": {
     "install-dependencies": "/bin/bash ./.devcontainer/install_dependencies.sh || echo 'Failing to install dependencies'",
     "install-yarn": "/bin/bash ./.devcontainer/install_yarn.sh || echo 'Script install_yarn failed'",
-    "configure-jekyll": "/bin/bash ./.devcontainer/configure_jekyll.sh || echo 'Jekyll configuration failed'",
+    "configure-jekyll": "/bin/bash ./.devcontainer/configure_jekyll.sh || echo 'Jekyll configuration failed'"
+  },
+  "postStartCommand": {
     "configure-docker": "/bin/bash ./.devcontainer/configure_docker.sh || echo 'Docker configuration failed'"
   },
   "features": {

.devcontainer/configure_docker.sh

@@ -1,6 +1,10 @@
 #!/bin/bash
 
-docker network create host-network
+if ! docker network list | grep host-network ; then
+  docker network create host-network
+else
+  echo "host-network already exists. Skipping creation."
+fi
 
 # Forward DNS queries to CoreDNS
 original_content=$(cat /etc/resolv.conf)