Update runtime nightly to correctly get python version (#175)

Summary: Pull Request resolved: #175

Test Plan:
Imported from GitHub, without a `Test Plan:` line.

Numbers resolved correctly: {F770684756} {F770685077}

Reviewed By: PaliC

Differential Revision: D39551010

Pulled By: anirbanr-fb-r2p

fbshipit-source-id: 95a2e05910beec445d52a717c159916100fdb248

Author: anirbanr-fb-r2p

.github/workflows/runtime_nightly.yaml

@@ -37,16 +37,20 @@ jobs:
         run: |
           docker run --rm multipy bash -c "if [[ ${{ matrix.python-minor-version }} -gt 7 ]]; then pip install -r compat-requirements.txt && multipy/runtime/build/interactive_embedded_interpreter --pyscript multipy/runtime/test_compat.py; fi"
 
+      - name: Set Python Version
+        run: |
+          echo "python-version=${{ matrix.python-major-version }}.${{ matrix.python-minor-version }}" >> $GITHUB_ENV
+
       - name: Create Tarball
         run: |
           docker cp $(docker run -d multipy):/opt/dist/multipy .
-          tar -czvf multipy_runtime_python${{ matrix.python-version }}.tar.gz multipy/
+          tar -czvf multipy_runtime_python${{ env.python-version }}.tar.gz multipy/
 
       - name: Update nightly release
         uses: pyTooling/Actions/releaser@main
         with:
-          tag: nightly-runtime-python${{ matrix.python-version }}
+          tag: nightly-runtime-python${{ env.python-version }}
           rm: true
           token: ${{ secrets.GITHUB_TOKEN }}
           files: |
-            multipy_runtime_python${{ matrix.python-version }}.tar.gz
+            multipy_runtime_python${{ env.python-version }}.tar.gz