docker: Add healthcheck

Signed-off-by: Woomymy <woomy@woomy.be>

docker/Dockerfile

@@ -5,6 +5,7 @@ COPY ./src ./src
 COPY ./prisma ./prisma
 COPY ./*.json ./
 COPY ./docker/entrypoint.sh ./
+COPY ./docker/healthcheck.sh ./
 
 RUN npm install
 RUN npx tsc
@@ -13,7 +14,7 @@ RUN npx prisma generate
 FROM node:18-alpine3.17 as prod
 WORKDIR /usr/src/bot
 RUN apk update && \
-    apk add --no-cache postgresql
+    apk add --no-cache postgresql curl
 RUN adduser -D -H bot bot
 
 COPY --from=build --chown=bot:bot /app/bot/package.json ./package.json
@@ -25,8 +26,12 @@ COPY --from=build --chown=bot:bot /app/bot/prisma ./prisma
 COPY --from=build --chown=bot:bot /app/bot/node_modules/@prisma/client/ ./node_modules/@prisma/client/
 COPY --from=build --chown=bot:bot /app/bot/node_modules/.prisma/client/ ./node_modules/.prisma/client/
 COPY --from=build --chown=bot:bot /app/bot/entrypoint.sh ./
+COPY --from=build --chown=bot:bot /app/bot/healthcheck.sh ./
 
 USER bot
 
 ENV NODE_ENV production
+
+HEALTHCHECK --interval=1m --timeout=10s --start-period=5s --retries=3 \
+    CMD [ "/usr/src/bot/healthcheck.sh" ]
 ENTRYPOINT [ "/usr/src/bot/entrypoint.sh" ]

docker/healthcheck.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+if test "$(curl http://localhost:${HEALTHCHECK_PORT})" == "ok"
+then
+    exit 0
+else
+    exit 1
+fi