Add install build instruction

Author: christopher-wild

.github/workflows/publish-to-pypi.yaml

@@ -20,6 +20,8 @@ jobs:
         run: |
           pip3 install .
           pip3 install .[pypi]
+          pip3 install build
+
       - name: Build Package
         run: |
           python -m build --no-isolation

.github/workflows/publish-to-test-pypi.yaml

@@ -21,6 +21,7 @@ jobs:
         run: |
           pip3 install .
           pip3 install .[pypi]
+          pip3 install build
       - name: Build Package
         run: |
           python -m build --no-isolation