cirrus-ci: add configuration file

Fixes: #17

Author: mathstuf

.cirrus.yml

@@ -0,0 +1,44 @@
+clippy_task:
+    container:
+        image: rustlang/rust:nightly
+    keyutils_script: apt-get update && apt-get install libkeyutils-dev
+    component_script: rustup component add clippy
+    update_script: cargo +nightly update
+    toolchain_cache:
+        folder: $RUSTUP_HOME
+        fingerprint_script: rustc +nightly --version
+    cargo_cache:
+        folder: $CARGO_HOME/registry
+        fingerprint_script: cat Cargo.lock
+    fmt_script: cargo +nightly clippy
+
+rustfmt_task:
+    container:
+        image: rustlang/rust:nightly
+    keyutils_script: apt-get update && apt-get install libkeyutils-dev
+    component_script: rustup component add rustfmt
+    fmt_script: cargo fmt --all -- --check
+
+linux_task:
+    container:
+      image: rust:latest
+    matrix:
+        - env:
+              RUSTVER: 1.32.0
+        - env:
+              RUSTVER: stable
+        - allow_failures: true
+          env:
+              RUSTVER: nightly
+    keyutils_script: apt-get update && apt-get install libkeyutils-dev
+    rustup_script: rustup toolchain install $RUSTVER
+    toolchain_cache:
+        folder: $RUSTUP_HOME
+        fingerprint_script: rustc +$RUSTVER --version
+    update_script: cargo +$RUSTVER update
+    cargo_cache:
+        folder: $CARGO_HOME/registry
+        fingerprint_script: cat Cargo.lock
+    build_script: cargo +$RUSTVER build
+    test_script: cargo +$RUSTVER test
+    before_cache_script: rm -rf $CARGO_HOME/registry/index