Fix issue with Docker image front-end

docker/Dockerfile

@@ -2,6 +2,7 @@ FROM node:20-alpine
 
 WORKDIR /usr/src/app
 
+RUN apk add --no-cache bash
 RUN apk add --no-cache gawk
 
 # Copy and install dependencies
@@ -18,4 +19,7 @@ RUN npm run build
 RUN npm i -g pm2
 RUN cp ecosystem.example.json ecosystem.config.json
 
-CMD pm2-runtime ecosystem.config.json
+## Make Docker-related scripts available in root folder
+COPY docker/*.sh .
+
+CMD ["bash", "entrypoint.sh"]

docker/build.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# We need to rebuild the front-end if $BASE changed
+
+base_file=dist/.base
+
+if [[ -e $base_file && "$BASE" == "$(cat $base_file)" ]] || [[ ! -e $base_file && "$BASE" == "" ]]; then
+  echo "Front-end rebuild skipped."
+else
+  echo "Rebuilding front-end because \$BASE changed to $BASE..."
+  # Build the site
+  npm run build
+  # Remember the current $BASE
+  echo "$BASE" > $base_file
+fi

docker/entrypoint.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+# Build site in background
+bash build.sh &
+
+pm2-runtime ecosystem.config.json