Avoid pip install in workflow if cache is hit (#592)

* Avoid pip install if cache is hit

* Fix true literal

* Separate extras install

* Fix syntax error

* Fix logical error

* Fix syntax error

.github/actions/install-python-and-package/action.yml

@@ -7,8 +7,8 @@ inputs:
     default: "3.9"
   extras-require:
     required: false
-    description: "The extras dependencies packages to be installed, for instance 'dev' or 'dev,publishing,notebooks'."
-    default: "dev"
+    description: "The extras dependencies packages to be installed, for instance 'docs' or 'publishing,notebooks'."
+
 runs:
   using: "composite"
   steps:
@@ -18,6 +18,7 @@ runs:
         python-version: ${{ inputs.python-version }}
 
     - uses: actions/cache@v3
+      id: cache-python-env
       with:
         path: ${{ env.pythonLocation }}
         key: ${{ env.pythonLocation }}-${{ hashFiles('setup.cfg') }}
@@ -29,19 +30,27 @@ runs:
         python3 --version
 
     - name: Upgrade pip
+      if: steps.cache-python-env.outputs.cache-hit != 'true'
       shell: bash {0}
       run: |
         python3 -m pip install --upgrade pip setuptools wheel
 
     # only necessary on linux to avoid bloated installs
     - name: Install tensorflow/pytorch cpu version
-      if: runner.os == 'Linux'
+      if: runner.os == 'Linux' && steps.cache-python-env.outputs.cache-hit != 'true'
       shell: bash {0}
       run: |
         python3 -m pip install torch --index-url https://download.pytorch.org/whl/cpu
         python3 -m pip install tensorflow-cpu
 
-    - name: Upgrade pip
+    - name: Install DIANNA
+      if: steps.cache-python-env.outputs.cache-hit != 'true'
+      shell: bash {0}
+      run: |
+        python3 -m pip install -e .[dev]
+
+    - name: Install DIANNA extras
+      if: ${{ inputs.extras-require }}
       shell: bash {0}
       run: |
         python3 -m pip install -e .[${{ inputs.extras-require }}]