Fix Dockerfile not using current sources (#60)

The Dockerfile previously cloned the LNT sources as a RUN step, which meant that
when rebuilding the image any changes to the LNT sources wouldn't be picked up
because it would be cached.

This PR fixes it alongside some other things:
- Don't clone the sources in a RUN step, instead COPY them from the build context
- Move the Dockerfile/docker-compose.yml files to the root so the source files are
  in the build directory
- Split out the install step so that we only COPY over the files necessary to run the
  install (to aid with layer caching)
- In the docker-compose.yml file, postgres:11 doesn't seem to exist anymore on docker.hub
  so upgrade it to 13, and fully qualify it so it can be used by podman
- Remove the .env file and just write the defaults directly in the docker-compose.yml file
- This also downgrades Jinja2 and pyyaml again to get building with Python 3.10, but these
  can probably be fixed in another PR

Author: lukel97

Dockerfile

@@ -0,0 +1,28 @@
+FROM python:3.10-alpine
+
+RUN apk update \
+  && apk add --no-cache --virtual .build-deps git g++ postgresql-dev yaml-dev \
+  && apk add --no-cache libpq
+
+WORKDIR /var/src/lnt
+
+COPY requirements.server.txt setup.py .
+# setup.py uses lnt.__version__ etc.
+COPY lnt/__init__.py lnt/__init__.py
+# we build the cperf extension during install
+COPY lnt/testing/profile lnt/testing/profile
+
+RUN pip3 install -r requirements.server.txt \
+  && apk --purge del .build-deps \
+  && mkdir /var/log/lnt
+
+COPY . .
+COPY docker/docker-entrypoint.sh docker/wait_db /usr/local/bin/
+
+VOLUME /var/log
+
+EXPOSE 8000
+
+ENV DB_ENGINE= DB_HOST= DB_USER= DB_PWD= DB_BASE=
+
+ENTRYPOINT docker-entrypoint.sh

docker/docker-compose.yml renamed to docker-compose.yml

@@ -21,8 +21,8 @@ services:
 
   db:
     container_name: lnt-postgres
-    image: postgres:11-alpine
+    image: docker.io/postgres:13-alpine
     environment:
       - POSTGRES_PASSWORD=${DB_PWD}
-      - POSTGRES_USER=${DB_USER}
-      - POSTGRES_DB=${DB_BASE}
+      - POSTGRES_USER=${DB_USER:-lntuser}
+      - POSTGRES_DB=${DB_BASE:-lnt}

docker/.env

@@ -2,6 +2,6 @@
 .
 psycopg2==2.9.10
 gunicorn==19.9.0
-Jinja2==3.1.6
+Jinja2==2.11.3
 progressbar2
-pyyaml==6.0
+pyyaml==5.1.2