Attempt to fix bors

Author: kpcyrd

.github/bors.toml

@@ -1,8 +1,2 @@
-status = [
-    "test (ubuntu-latest, stable)",
-    "test (macos-latest, stable)",
-    "test (windows-latest, stable)",
-    "rustfmt",
-    "clippy",
-]
+status = ["bors build finished"]
 delete_merged_branches = true

.github/workflows/default.yml

@@ -70,3 +70,33 @@ jobs:
         with:
           command: clippy
           args: --all --lib --tests -- --deny warnings
+
+  # These jobs doesn't actually test anything, but they're only used to tell
+  # bors the build completed, as there is no practical way to detect when a
+  # workflow is successful listening to webhooks only.
+  #
+  # ALL THE PREVIOUS JOBS NEEDS TO BE ADDED TO THE `needs` SECTION OF THIS JOB!
+
+  end-success:
+    name: bors build finished
+    if: success()
+    runs-on: ubuntu-latest
+    needs:
+    - test
+    - fmt
+    - clippy
+    steps:
+    - name: Mark the job as successful
+      run: exit 0
+
+  end-failure:
+    name: bors build finished
+    if: "!success()"
+    runs-on: ubuntu-latest
+    needs:
+    - test
+    - fmt
+    - clippy
+    steps:
+    - name: Mark the job as a failure
+      run: exit 1