Add healthcheck on the Docker container (#46)

* Add healthcheck

* Small syntax fixes

Author: sparunakian

Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:trixie-slim as prod
+FROM debian:trixie-slim AS prod
 
 RUN rm -f /etc/apt/apt.conf.d/docker-clean; echo 'Binary::apt::APT::Keep-Downloaded-Packages "true";' > /etc/apt/apt.conf.d/keep-cache
 
@@ -27,15 +27,18 @@ RUN --mount=type=cache,id=apt-cache,target=/var/cache/apt,sharing=locked \
 	fonts-noto-mono \
 	fonts-sil-gentium-basic \
 	fonts-recommended \
+	curl \
     && useradd -d /app python
 COPY . /app
+COPY ./healthcheck.sh /healthcheck.sh
 WORKDIR /app
 RUN chown python /app -R \
        && pip install -r requirements.txt --break-system-packages
 USER python
+HEALTHCHECK --retries=5 CMD ["/healthcheck.sh"]
 
 
-From prod as dev
+FROM prod AS dev
 USER root
 RUN --mount=type=cache,id=apt-cache,target=/var/cache/apt,sharing=locked \
     --mount=type=cache,id=apt-lib,target=/var/lib/apt,sharing=locked \
@@ -52,5 +55,3 @@ RUN USER=python && \
     printf "user: $USER\ngroup: $GROUP\n" > /etc/fixuid/config.yml
 
 ENTRYPOINT ["fixuid" ]
-
-

docker-compose.override.yml.example

@@ -1,4 +1,4 @@
-version: '3'
+---
 services:
   lo_api:
     build:

docker-compose.yml

@@ -1,3 +1,4 @@
+---
 services:
   lo_api:
     build:

healthcheck.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+HTTP_CODE=$(curl -qs -o /dev/null -w "%{http_code}" -X GET -H "secretkey: $SECRET_KEY" localhost:8000)
+RETURN_CODE=$?
+if [ "$RETURN_CODE" -eq 0 ]; then
+    if [ "$HTTP_CODE" != 200 ]; then
+        echo "Return code for localhost:8000 is not 200"
+        exit 1
+    fi
+else
+    echo "Can't query localhost:8000 with curl"
+    exit 1
+fi