Fix Docker deployment inputs

Include all addon workspaces and vendored dependencies in image builds, and expose deploy time plus commit metadata on the home page.

Amp-Thread-ID: https://ampcode.com/threads/T-01a033d4-0e44-708e-af0e-6166283416ff
Co-authored-by: Heaust Azure <heaust.azure@gmail.com>

server/deploy-docker.sh

@@ -50,8 +50,14 @@ if [[ "$(git rev-parse HEAD)" != "$fetched" ]]; then
     exit 1
 fi
 
+deployed_at="$(date -u +'%Y-%m-%dT%H:%M:%SZ')"
+commit_message="$(git log -1 --format=%s)"
+
 printf 'Building the production image...\n'
-"${compose[@]}" build --pull yawn
+"${compose[@]}" build --pull \
+    --build-arg "YAWN_DEPLOYED_AT=$deployed_at" \
+    --build-arg "YAWN_DEPLOY_COMMIT_MESSAGE=$commit_message" \
+    yawn
 "${compose[@]}" up -d --remove-orphans yawn
 
 container="$("${compose[@]}" ps -q yawn)"