feat(code-server): add code-server from the official codercom image

code-server/.env.example

@@ -0,0 +1,15 @@
+# Copy to .env and fill in. Never commit .env.
+#
+#   cp .env.example .env
+
+# Web UI login password. Required.
+# Generate one with: openssl rand -base64 24
+PASSWORD=
+
+# Git identity baked into the container (author + committer).
+GIT_NAME=
+GIT_EMAIL=
+
+# Container hostname, shown in the shell prompt.
+# Not named HOSTNAME: the deploying shell's own HOSTNAME would override it.
+SERVICE_HOSTNAME=code-server