Fix pyenv in workflow.

Author: runemalm

.github/actions/unittests/action.yml

@@ -30,6 +30,9 @@ runs:
 
     - name: Verify installed Python version
       run: |
+        export PYENV_ROOT="$HOME/.pyenv"
+        export PATH="$PYENV_ROOT/bin:$PATH"
+        eval "$(pyenv init --path)"
         ACTUAL=$(python -V)
         EXPECTED=${{ inputs.python-version }}
         echo "Python version installed: $ACTUAL"
@@ -41,17 +44,26 @@ runs:
 
     - name: Install pipenv
       run: |
+        export PYENV_ROOT="$HOME/.pyenv"
+        export PATH="$PYENV_ROOT/bin:$PATH"
+        eval "$(pyenv init --path)"
         python -m pip install --upgrade pip
         pip install pipenv
       shell: bash
 
     - name: Setup virtual environment
       run: |
+        export PYENV_ROOT="$HOME/.pyenv"
+        export PATH="$PYENV_ROOT/bin:$PATH"
+        eval "$(pyenv init --path)"
         pipenv --python ${{ inputs.python-version }} install --dev --deploy
       shell: bash
 
     - name: Verify virtual environment uses python version ${{ inputs.python-version }}
       run: |
+        export PYENV_ROOT="$HOME/.pyenv"
+        export PATH="$PYENV_ROOT/bin:$PATH"
+        eval "$(pyenv init --path)"
         if pipenv run python -V | grep -q "${{ inputs.python-version }}"; then
           echo "Python ${{ inputs.python-version }} is being used."
         else
@@ -62,5 +74,8 @@ runs:
 
     - name: Run unittests
       run: |
+        export PYENV_ROOT="$HOME/.pyenv"
+        export PATH="$PYENV_ROOT/bin:$PATH"
+        eval "$(pyenv init --path)"
         PYTHONPATH=./src:./tests pipenv run pytest ./tests
       shell: bash