Dockerfile: add utils/ in $PATH by default, for easy indexing

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>

README.adoc

@@ -255,7 +255,7 @@ as a front-end to reduce the load on the server running the Elixir code.
 == Keeping Elixir databases up to date
 
 To keep your Elixir databases up to date and index new versions that are released,
-we're proposing to use a script like `utils/index /srv/elixir-data --all` which is called
+we're proposing to use a script like `index /srv/elixir-data --all` which is called
 through a daily cron job.
 
 You can set `$ELIXIR_THREADS` if you want to change the number of threads used by
@@ -282,18 +282,14 @@ The Docker image does not contain any repositories.
 To index a repository, you can use the `index-repository` script.
 For example, to add the https://musl.libc.org/[musl] repository, run:
 
- # docker exec -it -e PYTHONUNBUFFERED=1 elixir-container \
-    /usr/local/elixir/utils/index -c '/srv/elixir-data musl'
-
-Without PYTHONUNBUFFERED environment variable, update logs may show up with a delay.
+ # docker exec -it elixir-container index /srv/elixir-data musl
 
 Or, to run indexing in a separate container:
 
- # docker run -e PYTHONUNBUFFERED=1 -v ./elixir-data/:/srv/elixir-data \
-    --entrypoint /usr/local/elixir/utils/index elixir -c \
-    '/srv/elixir-data musl'
+ # docker run -v ./elixir-data/:/srv/elixir-data \
+    --entrypoint index elixir /srv/elixir-data musl
 
-You can also use `utils/index /srv/elixir-data --all` to start indexing all officially supported repositories.
+You can also use `index /srv/elixir-data --all` to start indexing all officially supported repositories.
 
 After indexing is done, Elixir should be available under the following URL on your host:
 http://172.17.0.2/musl/latest/source
@@ -305,7 +301,7 @@ If 172.17.0.2 does not answer, you can check the IP address of the container by
 == Automatic repository updates
 
 The Docker image does not automatically update repositories by itself.
-You can, for example, start `utils/index /srv/elixir-data --all` in the container (or in a separate container, with Elixir data volume/directory mounted)
+You can, for example, start `index /srv/elixir-data --all` in the container (or in a separate container, with Elixir data volume/directory mounted)
 from cron on the host to periodically update repositories.
 
 == Using Docker image as a development server

docker/Dockerfile

@@ -57,7 +57,7 @@ ARG ELIXIR_VERSION
 
 ENV ELIXIR_VERSION=$ELIXIR_VERSION \
     ELIXIR_ROOT=/srv/elixir-data \
-    PATH="/usr/local/elixir/venv/bin:$PATH" \
+    PATH="/usr/local/elixir/utils:/usr/local/elixir/venv/bin:$PATH" \
     PYTHONUNBUFFERED=1
 
 ENTRYPOINT ["/usr/sbin/apache2ctl", "-D", "FOREGROUND"]