Adds a CI job for hadolint over all the Dockerfiles, fixes the minor thing it complained about

.github/workflows/reusable-ci-backend.yml

@@ -106,3 +106,26 @@ jobs:
         run: |
           cd src/
           pipenv run coveralls --service=github
+
+  dockerfile-lint:
+    name: "Lint ${{ matrix.dockerfile }}"
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        dockerfile:
+          - Dockerfile
+          - docker-builders/Dockerfile.qpdf
+          - docker-builders/Dockerfile.jbig2enc
+          - docker-builders/Dockerfile.psycopg2
+          - docker-builders/Dockerfile.pikepdf
+      fail-fast: false
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        uses: hadolint/hadolint-action@v2.0.0
+        with:
+          failure-threshold: warning
+          dockerfile: ${{ matrix.dockerfile }}
+          ignore: DL3008,DL3013,DL3003

Dockerfile

@@ -117,19 +117,18 @@ COPY gunicorn.conf.py .
 # setup docker-specific things
 # Use mounts to avoid copying installer files into the image
 # These change sometimes, but rarely
-ARG DOCKER_SRC=/usr/src/paperless/src/docker/
-WORKDIR ${DOCKER_SRC}
+WORKDIR /usr/src/paperless/src/docker/
 
 COPY [ \
-	"docker/imagemagick-policy.xml", \
-	"docker/supervisord.conf", \
-	"docker/docker-entrypoint.sh", \
-	"docker/docker-prepare.sh", \
-	"docker/paperless_cmd.sh", \
-	"docker/wait-for-redis.py", \
-	"docker/management_script.sh", \
-	"docker/install_management_commands.sh", \
-	"${DOCKER_SRC}" \
+  "docker/imagemagick-policy.xml", \
+  "docker/supervisord.conf", \
+  "docker/docker-entrypoint.sh", \
+  "docker/docker-prepare.sh", \
+  "docker/paperless_cmd.sh", \
+  "docker/wait-for-redis.py", \
+  "docker/management_script.sh", \
+  "docker/install_management_commands.sh", \
+  "/usr/src/paperless/src/docker/" \
 ]
 
 RUN set -eux \
@@ -162,15 +161,15 @@ RUN --mount=type=bind,from=qpdf-builder,target=/qpdf \
     && apt-get install --yes --no-install-recommends /qpdf/usr/src/qpdf/libqpdf28_*.deb \
     && apt-get install --yes --no-install-recommends /qpdf/usr/src/qpdf/qpdf_*.deb \
   && echo "Installing pikepdf and dependencies" \
+    && python3 -m pip install --no-cache-dir /pikepdf/usr/src/wheels/pyparsing*.whl \
     && python3 -m pip install --no-cache-dir /pikepdf/usr/src/wheels/packaging*.whl \
     && python3 -m pip install --no-cache-dir /pikepdf/usr/src/wheels/lxml*.whl \
     && python3 -m pip install --no-cache-dir /pikepdf/usr/src/wheels/Pillow*.whl \
-    && python3 -m pip install --no-cache-dir /pikepdf/usr/src/wheels/pyparsing*.whl \
     && python3 -m pip install --no-cache-dir /pikepdf/usr/src/wheels/pikepdf*.whl \
-    && python -m pip list \
+    && python3 -m pip list \
   && echo "Installing psycopg2" \
     && python3 -m pip install --no-cache-dir /psycopg2/usr/src/wheels/psycopg2*.whl \
-    && python -m pip list
+    && python3 -m pip list
 
 # Python dependencies
 # Change pretty frequently