I’m trying to set up so that my scala tests are run on git push.
I run locally on MacOS, and the Ci/Cd is run on Linux, so some things are a bit of a mystery.

It appears sbt is not installed by default. So I took at look at this stack overflow question . It suggests I need to do the following:

wget http://apt.typesafe.com/repo-deb-build-0002.deb
sudo dpkg -i repo-deb-build-0002.deb
sudo apt-get update
sudo apt-get install sbt
But that seems to be problematic.  The error messages claim there is something wrong on the typesafe side.   Has anyone seen something like this before?
70 $ dpkg -i repo-deb-build-0002.deb
71 Selecting previously unselected package typesafe-repo.
72 (Reading database ... 4394 files and directories currently installed.)
73 Preparing to unpack repo-deb-build-0002.deb ...
74 Unpacking typesafe-repo (2.0-build-0003) ...
75 Setting up typesafe-repo (2.0-build-0003) ...
76 Warning: The postinst maintainerscript of the package typesafe-repo
77 Warning: seems to use apt-key (provided by apt) without depending on gnupg or gnupg2.
78 Warning: This will BREAK in the future and should be fixed by the package maintainer(s).
79 Note: Check first if apt-key functionality is needed at all - it probably isn't!
80 E: gnupg, gnupg2 and gnupg1 do not seem to be installed, but one of them is required for this operation
81 dpkg: error processing package typesafe-repo (--install):
82  installed typesafe-repo package post-installation script subprocess returned error exit status 255
83 Errors were encountered while processing:
84  typesafe-repo
88 ERROR: Job failed: exit code 1
              
Try with
echo "deb https://dl.bintray.com/sbt/debian /" | sudo tee -a /etc/apt/sources.list.d/sbt.list
curl -sL "https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x2EE0EA64E40A89B84B2DF73499E82A75642AC823" | sudo apt-key add
sudo apt-get update
sudo apt-get install sbt
source.
              
That’s promising, but there is a warning about parsing the output of curl.
Screenshot 2020-02-17 at 13.19.14697×439 70.8 KB
What do you intend to accomplish with ... | apt-key add?   I fear it’s not working as you intended?
Screenshot 2020-02-17 at 13.21.52714×320 41.1 KB
              
OK, now I have some success.  Here is the content of the .gitlab.yml file which seems to work.   Apparently apt-get install sbt installs scala but not java, so I have to also install default-jdk.
image: lokedhs/sbcl-quicklisp
stages:
  - test
before_script:
  - apt-get update -y
  - apt-get install -y csh
  - apt-get install -y curl
  - apt-get install -y gnupg
  - echo "deb https://dl.bintray.com/sbt/debian /" | tee -a /etc/apt/sources.list.d/sbt.list
  - curl -sL "https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x2EE0EA64E40A89B84B2DF73499E82A75642AC823" | apt-key add
  - apt-get update -y
  - apt-get install -y default-jdk
  - apt-get install -y sbt
  - sbt sbtVersion
  - apt-get install -y graphviz
  - apt-get install -y gnuplot
  - apt-get install -y git
unit-scala:
  stage: test
  script: ./bin/auto-test-scala-on-push.csh
unit-cl:
  stage: test
  script: ./bin/auto-test-lisp-on-push.lisp
              
Disclaimer I am not an expert in CI but you shouldn’t need to install all that every time.
I haven’t used gitlab, but the tools I have worked with usually run in some containerized environment which let you specify a base image which had the base tools already installed.
              
Thanks for the suggestion. In the mean time, my system admin helped me set one up.

Here is the script file.
FROM lokedhs/sbcl-quicklisp
RUN apt-get update                              \
  && RUNLEVEL=1 DEBIAN_FRONTEND=noninteractive  \
     apt-get install -y --no-install-recommends \
       graphviz \
       gnuplot \
       git \
       csh \
       curl \
       gnupg \
       default-jdk \
  && echo "deb https://dl.bintray.com/sbt/debian /" | tee -a /etc/apt/sources.list.d/sbt.list \
  && curl -sL "https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x2EE0EA64E40A89B84B2DF73499E82A75642AC823" | apt-key add \
  && apt-get update \
  && RUNLEVEL=1 DEBIAN_FRONTEND=noninteractive \
     apt-get install -y --no-install-recommends \
       sbt \
  && apt-get autoremove                         \
  && apt-get clean \
  && sbt sbtVersion