fix: change to relative working directory (#44)

Signed-off-by: Max Xu <maxs.xu@gmail.com>
diff --git a/docbot/action.yml b/docbot/action.yml
index 0156b25..3de4f48 100644
--- a/docbot/action.yml
+++ b/docbot/action.yml
@@ -10,3 +10,4 @@
   steps:
     - run: go run main.go
       shell: bash
+      working-directory: docbot
diff --git a/docbot/go.sum b/docbot/go.sum
new file mode 100644
index 0000000..cc47aa0
--- /dev/null
+++ b/docbot/go.sum
@@ -0,0 +1,31 @@
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