Adjust repo to be buildable via builder image

[tumido]

Steps to reproduce:

1. Build the builder image locally

$ podman build -t builder .
[1/2] STEP 1/1: FROM quay.io/operate-first/opf-toolbox:v0.4.2 AS toolbox
--> f1698375fd2
[2/2] STEP 1/5: FROM quay.io/thoth-station/s2i-custom-py38-notebook:v0.3.2
[2/2] STEP 2/5: ENV XDG_DATA_HOME=/usr/share/.local/share     XDG_CACHE_HOME=/usr/share/.cache     XDG_CONFIG_HOME=/usr/share/.config
--> 3445bf5a511
[2/2] STEP 3/5: ENV KUSTOMIZE_PLUGIN_PATH=$XDG_CONFIG_HOME/kustomize/plugin/
--> 7b19efc41fd
[2/2] STEP 4/5: COPY --from=toolbox /usr/local/bin /usr/local/bin
--> b5a492b7f53
[2/2] STEP 5/5: COPY --from=toolbox $KUSTOMIZE_PLUGIN_PATH/viaduct.ai/v1/ksops $KUSTOMIZE_PLUGIN_PATH/viaduct.ai/v1/ksops
[2/2] COMMIT builder
--> 064d1dd6484
Successfully tagged localhost/builder:latest

2. Try building the repo with it

$ s2i build . builder --as-dockerfile /tmp/build/Dockerfile
Application dockerfile generated in /tmp/build/Dockerfile

$ cd /tmp/build

$ podman build -t test .
STEP 1/8: FROM builder
STEP 2/8: LABEL "io.openshift.s2i.build.commit.date"="Wed Aug 18 15:46:56 2021 +0200"       "io.openshift.s2i.build.commit.id"="59ca6fbe0dc4cffecdf818d4b618610968a06226"       "io.openshift.s2i.build.commit.ref"="main"       "io.openshift.s2i.build.commit.message"="feat:created Containerfile with opf-toolbox tools (#7)"       "io.openshift.s2i.build.source-location"="/home/tcoufal/Programming/AI-CoE/operate-first/hitchhikers-guide/."       "io.openshift.s2i.build.image"="builder"       "io.openshift.s2i.build.commit.author"="Michal Drla <mdrla@redhat.com>"
--> a10630fe4c6
STEP 3/8: USER root
--> df2cd30b87a
STEP 4/8: COPY upload/src /tmp/src
--> 80c97d9f4c0
STEP 5/8: RUN chown -R 1001:0 /tmp/src
--> 57a0d101915
STEP 6/8: USER 1001
--> afddb250afe
STEP 7/8: RUN /usr/libexec/s2i/assemble
...

3. Observe failures