feat: invite bors (#52)

.github/workflows/build.yml

@@ -1,5 +1,12 @@
 on:
   push:
+    branches-ignore:
+      # ignore tmp branches used by bors
+      - 'staging.tmp*'
+      - 'trying.tmp*'
+      - 'staging*.tmp'
+      # ignore staging branch used by bors, this is handled by bors.yml
+      - 'staging'
   pull_request:
 
 name: ci

bors.toml

@@ -0,0 +1,6 @@
+status = ["Build"]
+use_squash_merge = true
+timeout_sec = 28800
+block_labels = ["not-ready-to-merge", "WIP", "blocked-by-other-PR", "merge-conflict"]
+delete_merged_branches = true
+cut_body_after = "---"