ci: fix docker image not including git hash.

Fix the Docker image not including the git hash of the build. On
DockerHub we had to set it with a build hook, but now with Github we
set it as part of the build-push-action.

.github/workflows/test.yaml

@@ -68,6 +68,9 @@ jobs:
           cache-from: type=registry,ref=ghcr.io/${{ github.repository }}:buildcache
           cache-to: type=registry,ref=ghcr.io/${{ github.repository }}:buildcache,mode=max
 
+          build-args: |
+            SOURCE_COMMIT=${{ github.sha }}
+
   test:
     runs-on: ubuntu-latest
     needs: docker

hooks/README.md

@@ -1,27 +0,0 @@
-The directory contains hooks used by Docker Hub when building images:
-
-    Docker Hub allows you to override and customize the `build`, `test` and `push`
-    commands during automated build and test processes using hooks. For
-    example, you might use a build hook to set build arguments used only during
-    the build process. (You can also set up custom build phase hooks to perform
-    actions in between these commands.)
-
-    Use these hooks with caution. The contents of these hook files replace the
-    basic `docker` commands, so you must include a similar build, test or push
-    command in the hook or your automated process does not complete.
-
-    To override these phases, create a folder called `hooks` in your source code
-    repository at the same directory level as your Dockerfile. Create a file
-    called `hooks/build`, `hooks/test`, or `hooks/push` and include commands that the
-    builder process can execute, such as `docker` and `bash` commands (prefixed
-    appropriately with `#!/bin/bash`).
-
-    These hooks will be running on an instance of Amazon Linux 2, a distro
-    based on Ubuntu, which includes interpreters such as Perl and Python and
-    utilities such as git or curl. Please check the link above for the full
-    list.
-
-# See also
-
-* https://docs.docker.com/docker-hub/builds/advanced
-* https://stackoverflow.com/questions/59057978/passing-source-commit-to-dockerfile-commands-on-docker-hub

hooks/build

@@ -1,13 +0,0 @@
-#!/bin/bash
-
-# This file is used to add the Git commit hash to the Docker image when the
-# image is built by Docker Hub.
-#
-# https://docs.docker.com/docker-hub/builds/advanced/
-# https://stackoverflow.com/questions/59057978/passing-source-commit-to-dockerfile-commands-on-docker-hub
-#
-# SOURCE_COMMIT: the SHA1 hash of the commit being tested.
-# DOCKERFILE_PATH: the dockerfile currently being built.
-# IMAGE_NAME: the name and tag of the Docker repository being built. (This variable is a combination of DOCKER_REPO:DOCKER_TAG.)
-
-docker build --build-arg SOURCE_COMMIT=$SOURCE_COMMIT -f $DOCKERFILE_PATH -t $IMAGE_NAME .