fix: fixing mising pip PATH (#585)

* fix: fixing mising pip PATH

* chore: removing User Site Directory

Co-authored-by: Callum James Tait <callum.tait@photobox.com>

runner/Dockerfile.dindrunner

@@ -73,6 +73,7 @@ RUN export ARCH=$(echo ${TARGETPLATFORM} | cut -d / -f2) \
 	docker --version
 
 ENV RUNNER_ASSETS_DIR=/runnertmp
+ENV HOME=/home/runner
 
 # Runner download supports amd64 as x64
 #
@@ -110,6 +111,9 @@ VOLUME /var/lib/docker
 
 COPY --chown=runner:docker patched $RUNNER_ASSETS_DIR/patched
 
+# Add the Python "User Script Directory" to the PATH
+ENV PATH="${PATH}:${HOME}/.local/bin"
+
 # No group definition, as that makes it harder to run docker.
 USER runner