fix: allow running tox with different python versions

tox would enforce python3.8 without this change
Now we install tox in that specific python and then run tox from it

.github/workflows/ci.yml

@@ -30,18 +30,31 @@ jobs:
     - name: Build Docker
       run: |
         docker compose -f .github/docker-compose-ci.yml up -d
-        docker exec ecomworker bash -c "sudo apt-get update -y; sudo apt-get install python${{ matrix.python-version }} python${{ matrix.python-version }}-dev -y;"
-
+        docker exec ecomworker bash -c "
+        sudo apt-get update -y &&
+        sudo apt-get install python${{ matrix.python-version }} \
+        python${{ matrix.python-version }}-dev \
+        python${{ matrix.python-version }}-distutils -y &&
+        curl -sS https://bootstrap.pypa.io/get-pip.py | python${{ matrix.python-version }};"
+        # Need to install pip from source here^ otherwise some packages don't get installed
     - name: Format Python Version
       run: |
         PYTHON_VERSION=${{ matrix.python-version }}
         FORMATTED_VERSION=${PYTHON_VERSION/3./py3} 
         echo "PYTHON_VERSION=$FORMATTED_VERSION" >> $GITHUB_ENV
+    - name: Install dependencies
+      run: |
+          docker exec -t ecomworker bash -c "
+            cd /edx/app/ecomworker/ecomworker &&
+            python${{ matrix.python-version }} -m pip install tox
+          "
     - name: Run Tests
       env:
         TARGETS: ${{ matrix.test-target }}
       run: |
-        docker exec ecomworker bash -c "cd /edx/app/ecomworker/ecomworker && PYTHON_VERSION=$PYTHON_VERSION make $TARGETS"
+        docker exec ecomworker bash -c "
+        cd /edx/app/ecomworker/ecomworker &&
+        PYTHON_VERSION=${{ matrix.python-version }} PYTHON_ENV=$PYTHON_VERSION make $TARGETS"
 
     - name: Run Coverage
       if: matrix.test-target == 'test' && matrix.python-version == '3.8'

Makefile

@@ -1,5 +1,6 @@
 PACKAGE = ecommerce_worker
-PYTHON_VERSION_VAR=$(if $(PYTHON_VERSION),$(PYTHON_VERSION),py312)
+PYTHON_VERSION_VAR=$(if $(PYTHON_VERSION),$(PYTHON_VERSION),3.12)
+PYTHON_ENV_VAR=$(if $(PYTHON_ENV),$(PYTHON_ENV),py312)
 
 help: ## display this help message
 	@echo "Please use \`make <target>' where <target> is one of"
@@ -15,7 +16,7 @@ worker: ## start the Celery worker process
 	celery -A ecommerce_worker worker --app=$(PACKAGE).celery_app:app --loglevel=info --queue=fulfillment,email_marketing
 
 test: requirements_tox  ## run unit tests and report on coverage
-	tox -e ${PYTHON_VERSION_VAR}
+	python${PYTHON_VERSION_VAR} -m tox -e ${PYTHON_ENV_VAR}
 
 quality: requirements_tox  ## run pep8 and pylint
 	tox -e quality