This PR updates the GHA file to run a version of the quick-start tests with the latest checked-out version of the code.

In the process, I realised that the targets where re-built even though we started the cluster in non-development mode. This is, the following:

docker compose up -d nginx --scale worker=2
docker compose run --rm -T faasm-cli ./bin/inv_wrapper.sh dev.cc pool_runner

would re-build the pool_runner binary from scratch.

This is because we were also mounting both (i) the host's pwd in /usr/local/code/faasm and (ii) the host's Conan cache in /root/.conan. This PR adds two environment variables that make the hosts pwd and conan-cache point to garbage directories in the container unless invoked via ./bin/cli.sh.

The various configurations of (non)-dev clusters and env. variables are getting a bit out of hand. In coming PRs I would like to:

• Move ./bin/cli.sh to an inv task
• Move all cluster/deployment related tasks into faasmcli, maintain faasmcli as a separate repository, and move all non-cluster related tasks to a regular tasks directory in faasm.