Add go_hello workflow

.forgejo/workflows/demo_docker.yaml

@@ -1,6 +0,0 @@
-on: [push]
-jobs:
-  test_docker:
-    runs-on: ubuntu-22.04
-    steps:
-      - run: docker info

.forgejo/workflows/go_hello.yaml

@@ -0,0 +1,12 @@
+on: [push]
+jobs:
+  test:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.16.1' # The Go version to download (if necessary) and use.
+      - run: go run hello.go
+
+