CI: build: add workflow_dispatch

.forgejo/workflows/build.yaml

@@ -1,5 +1,12 @@
 on:
   push:
+  workflow_dispatch:
+    inputs:
+      verbose:
+        description: "Verbose"
+        required: false
+        default: false
+        type: boolean
 
 jobs:
   build:
@@ -21,6 +28,11 @@ jobs:
       - name: Run basic test (bootstrap)
         run: pytest -s tests/basic.py
 
+      - name: Echo env
+        if: ${{ inputs.verbose }}
+        run: |
+          echo '${{ toJSON(env) }}'
+
       - name: Log in to container registry
         uses: actions/podman-login@v1
         with: