Add poetry to GHA.

Author: eswan18

.github/workflows/publish.yml

@@ -27,9 +27,17 @@ jobs:
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+      - uses: Gr1N/setup-poetry@v8
+        with:
+          poetry-version: "1.3.2"
+      - name: Install package
+        run: poetry install
+
 
-      # Runs a single command using the runners shell
-      - name: do it all
+      - name: Test stuff
         run: |
           mkdir build
           cd build