Incorporated OIDC for authenticating towards Azure in GH Action

.github/workflows/deploy_to_azure.yml

@@ -35,7 +35,7 @@ jobs:
         run: cd hvalfangst_function && zip -r ../release.zip ./*
 
       - name: Upload artifact for deployment job
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: hvalfangst-function-app
           path: |
@@ -50,7 +50,7 @@ jobs:
       url: ${{ steps.deploy-to-function.outputs.webapp-url }}
     steps:
       - name: Download artifact from build job
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v3
         with:
           name: hvalfangst-function-app
 
@@ -62,7 +62,7 @@ jobs:
         id: deploy-to-function
         with:
           app-name: 'hvalfangstlinuxfunctionapp'
-          slot-name: 'Production'
+            slot-name: 'Production'
           package: ${{ env.AZURE_FUNCTIONAPP_PACKAGE_PATH }}
           scm-do-build-during-deployment: true
           enable-oryx-build: true