fix: bad poetry install in docs build (#174)

# Description

Fixing the bad poetry install command as I did in the other
repositories.

CQCL/pytket-quantinuum#532

# Related issues

Please mention any github issues addressed by this PR.

# Checklist

- [ ] I have performed a self-review of my code.
- [ ] I have commented hard-to-understand parts of my code.
- [ ] I have made corresponding changes to the public API documentation.
- [ ] I have added tests that prove my fix is effective or that my
feature works.
- [ ] I have updated the changelog with any user-facing changes.

.github/workflows/build_and_test.yml

@@ -74,7 +74,7 @@ jobs:
       run: |
         cd docs
         bash ./install.sh
-        for w in `find wheelhouse/ -type f -name "*.whl"` ; do poetry install $w ; done
+        for w in `find wheelhouse/ -type f -name "*.whl"` ; do poetry run pip install $w ; done
     - name: Build docs
       if: (matrix.os == 'ubuntu-latest') && (github.event_name == 'pull_request' || github.event_name == 'schedule' )
       timeout-minutes: 20
@@ -140,4 +140,4 @@ jobs:
       timeout-minutes: 20
       run: |
         cd docs
-        poetry run bash ./build-docs.sh
+        poetry run bash ./build-docs.sh