(WiP) Test on CI

Include FreeBSD testing since @kubo39 made it work there.

Author: tormol

.cirrus.yml

@@ -0,0 +1,44 @@
+task:
+  name: FreeBSD amd64 nightly
+  freebsd_instance:
+    image: freebsd-12-1-release-amd64
+    cpu: 1
+    memory: 1
+  setup_script:
+    - pkg install -y curl bash nasm
+    - curl https://sh.rustup.rs -sSf --output rustup.sh
+    - sh rustup.sh --default-toolchain nightly --profile minimal -y
+  cargo_cache:
+    folder: $HOME/.cargo/registry
+    fingerprint_script: cat Cargo.lock 2> /dev/null || true
+  build_script:
+    - . $HOME/.cargo/env
+    - ./build.sh
+  test_script:
+    - ./tinyrust
+    - test `./tinyrust` == 'Hello!'
+    - wc -c ./tinyrust
+  before_cache_script:
+    - rm -rf $HOME/.cargo/registry/index
+
+task:
+  name: Linux amd64 nightly
+  container:
+    image: rustlang/rust:nightly
+    cpu: 1
+    memory: 1
+  allow_failures: false
+  cargo_cache:
+    folder: $HOME/.cargo/registry
+    fingerprint_script: cat Cargo.lock 2> /dev/null || true
+  setup_script:
+    - apt-get update
+    - apt-get install -yqq nasm bsdmainutils
+  build_script:
+    - ./build.sh
+  test_script:
+    - ./tinyrust
+    - test "$(./tinyrust)" == 'Hello!'
+    - test "$(wc -c < tinyrust)" -eq 137
+  before_cache_script:
+    - rm -rf $HOME/.cargo/registry/index

README.md

@@ -1,5 +1,7 @@
 # Using Rust to make a 137-byte static AMD64 Linux binary
 
+[![Build Status](https://api.cirrus-ci.com/github/tormol/tiny-rust-executable.svg)](https://cirrus-ci.com/github/tormol/tiny-rust-executable)
+
 Requires nightly Rust because it uses the `sc` crate to make direct
 system calls.