ci: enable dispatch of apps (#751)

<!--- Provide a general summary of your changes in the Title above -->

## Description

<!--- Describe your changes in detail -->

Adding a dispatch to be able to deploy apps given a version and
environment input value

## Related Issue(s)

- #{issue number}

## Verification

- [ ] **Your** code builds clean without any errors or warnings
- [ ] Manual testing done (required)
- [ ] Relevant automated test added (if you find this hard, leave it and
we'll help out)

## Documentation

- [ ] Documentation is updated (either in `docs`-directory, Altinnpedia
or a separate linked PR in
[altinn-studio-docs.](https://github.com/Altinn/altinn-studio-docs), if
applicable)

.github/workflows/dispatch-apps.yml

@@ -0,0 +1,61 @@
+name: Dispatch Apps
+
+on:
+  workflow_dispatch:
+    inputs:
+      environment:
+        description: "Environment to deploy to"
+        required: true
+        default: "test"
+        type: choice
+        options:
+          - test
+          - staging
+          - prod
+      version:
+        description: "Version to deploy"
+        required: true
+        type: string
+      runMigration:
+        description: "Whether to run migration or not"
+        default: false
+        required: false
+        type: boolean
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref_name }}
+
+jobs:
+  generate-git-short-sha:
+    name: Generate git short sha
+    uses: ./.github/workflows/action-generate-git-short-sha.yml
+
+  get-current-version:
+    name: Get current version
+    uses: ./.github/workflows/action-get-current-version.yml
+
+  check-for-changes:
+    name: Check for changes
+    uses: ./.github/workflows/action-check-for-changes.yml
+
+  deploy-apps:
+    name: Deploy apps to ${{ inputs.environment }}
+    needs:
+      - generate-git-short-sha
+      - get-current-version
+      - check-for-changes
+    uses: ./.github/workflows/action-deploy-apps.yml
+    secrets:
+      AZURE_CLIENT_ID: ${{ secrets.AZURE_CLIENT_ID }}
+      AZURE_TENANT_ID: ${{ secrets.AZURE_TENANT_ID }}
+      AZURE_SUBSCRIPTION_ID: ${{ secrets.AZURE_SUBSCRIPTION_ID }}
+      AZURE_RESOURCE_GROUP_NAME: ${{ secrets.AZURE_RESOURCE_GROUP_NAME }}
+      AZURE_ENVIRONMENT_KEY_VAULT_NAME: ${{ secrets.AZURE_ENVIRONMENT_KEY_VAULT_NAME }}
+      AZURE_CONTAINER_APP_ENVIRONMENT_NAME: ${{ secrets.AZURE_CONTAINER_APP_ENVIRONMENT_NAME }}
+      AZURE_APP_INSIGHTS_CONNECTION_STRING: ${{ secrets.AZURE_APP_INSIGHTS_CONNECTION_STRING }}
+      AZURE_APP_CONFIGURATION_NAME: ${{ secrets.AZURE_APP_CONFIGURATION_NAME }}
+    with:
+      environment: ${{ inputs.environment }}
+      region: norwayeast
+      version: ${{ inputs.version }}
+      runMigration: ${{ inputs.runMigration }}