Docker build of 2.6 branch is broken

[etj]

Description

This commit is breaking the Dockerfile, and the build fails.

docker log

$ docker build . --tag pycsw-dynamic:2.6.x
[+] Building 7.1s (6/17)                                                                                                         
 => [internal] load build definition from Dockerfile                                                                        0.0s
 => => transferring dockerfile: 2.88kB                                                                                      0.0s
 => WARN: Empty continuation line found in: RUN apt-get update && apt-get install --yes         ca-certificates libexpat1   0.0s
 => [internal] load .dockerignore                                                                                           0.0s
 => => transferring context: 260B                                                                                           0.0s
 => [internal] load metadata for docker.io/library/python:3.8-slim-buster                                                   1.6s
 => [internal] load build context                                                                                           0.2s
 => => transferring context: 8.37MB                                                                                         0.2s
 => CACHED [ 1/13] FROM docker.io/library/python:3.8-slim-buster@sha256:8799b0564103a9f36cfb8a8e1c562e11a9a6f2e3bb214e2adc  0.0s
 => ERROR [ 2/13] RUN apt-get update && apt-get install --yes         ca-certificates libexpat1 ARG BUILD_DEV_IMAGE="false  5.4s
------                                                                                                                           
 > [ 2/13] RUN apt-get update && apt-get install --yes         ca-certificates libexpat1 ARG BUILD_DEV_IMAGE="false":            
#0 0.661 Get:1 http://deb.debian.org/debian buster InRelease [122 kB]                                                            
#0 0.824 Get:2 http://deb.debian.org/debian-security buster/updates InRelease [34.8 kB]                                          
#0 0.905 Get:3 http://deb.debian.org/debian buster-updates InRelease [56.6 kB]                                                   
#0 1.069 Get:4 http://deb.debian.org/debian buster/main amd64 Packages [7909 kB]                                                 
#0 3.225 Get:5 http://deb.debian.org/debian-security buster/updates/main amd64 Packages [549 kB]
#0 3.353 Get:6 http://deb.debian.org/debian buster-updates/main amd64 Packages [8788 B]
#0 4.105 Fetched 8680 kB in 4s (2365 kB/s)
#0 4.105 Reading package lists...
#0 4.648 Reading package lists...
#0 5.167 Building dependency tree...
#0 5.264 Reading state information...
#0 5.357 E: Unable to locate package ARG
#0 5.357 E: Unable to locate package BUILD_DEV_IMAGE
------
Dockerfile:42
--------------------
  41 |     
  42 | >>> RUN apt-get update && apt-get install --yes \
  43 | >>>         ca-certificates libexpat1 \
  44 | >>> 
  45 | >>> # Build arguments
  46 | >>> # add "--build-arg BUILD_DEV_IMAGE=true" to Docker build command when building with test/doc tools
  47 | >>> 
  48 | >>> ARG BUILD_DEV_IMAGE="false"
  49 |     
--------------------
ERROR: failed to solve: process "/bin/sh -c apt-get update && apt-get install --yes         ca-certificates libexpat1 ARG BUILD_DEV_IMAGE=\"false\"" did not complete successfully: exit code: 100

Environment

• operating system: Ubuntu 20.04.6 LTS
• Python version:
• pycsw version: branch 2.6
• source/distribution
  • git clone
  • DebianGIS/UbuntuGIS
  • PyPI
  • zip/tar.gz
  • other (please specify):
• web server
  • Apache/mod_wsgi
  • CGI
  • other (please specify):

Steps to Reproduce

• Clone the repo and switch to branch 2.6

  git clone https://github.com/geopython/pycsw.git -b 2.6
  

• Build the docker image:

   cd pycsw
   docker build . --tag pycsw-dynamic:2.6.x 
  

Additional Information

# docker --version
Docker version 24.0.2, build cb74dfc