ci: add smoke workflow Fase B5

.forgejo/workflows/smoke.yml

@@ -0,0 +1,19 @@
+name: smoke
+on:
+  push:
+    branches: [main]
+jobs:
+  hello:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Smoke test message
+        run: |
+          echo "Forgejo Actions OK"
+          echo "Sprint Soberania Tecnologica EU - Fase B5 smoke test verde"
+      - name: Runtime context
+        run: |
+          uname -a
+          pwd
+          whoami
+          echo "GITHUB_REF=$GITHUB_REF"
+          echo "GITHUB_SHA=$GITHUB_SHA"