Create test repo on Gitpod start (#1248)

Co-authored-by: Anbraten <anton@ju60.de>

contrib/woodpecker-test-repo/.woodpecker/demo.yml

@@ -0,0 +1,5 @@
+pipeline:
+  demo:
+    image: 'alpine'
+    commands:
+      - echo 'Demo'

contrib/woodpecker-test-repo/.woodpecker/test.yml

@@ -0,0 +1,15 @@
+pipeline:
+  test_1:
+    image: 'alpine'
+    commands:
+      - echo 'Test 1'
+
+  test_2:
+    image: 'alpine'
+    commands:
+      - echo 'Test 2'
+
+  test_3:
+    image: 'alpine'
+    commands:
+      - echo 'Test 3'