Add self-test workflow and bors config

.github/workflows/self-test.yml

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+jobs:
+  pull_request:
+    uses: ./.github/workflows/pull_request.yml
+  staging:
+    uses: ./.github/workflows/staging.yml
+  nightly:
+    uses: ./.github/workflows/nightly.yml
+  success:
+    needs: [pull_request, staging, nightly]
+    runs-on: ubuntu-latest
+    steps:
+    - run: true
+
+on:
+  pull_request:
+    branches: [prīmum]
+  push:
+    branches: [staging, trying]

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "self-test"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]

bors.toml

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+status = ["success"]

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}