Add Docker based CI pipeline

.dockerignore

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+target/
+Dockerfile

.github/workflows/docker-image.yml

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+name: Test suite
+
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  schedule:
+  - cron: "0 2 * * 1-5"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Prepare the AVR Rust build environment
+      run:
+        docker build . --file Dockerfile.ci --tag avr-rust/ruduino.ci:$GITHUB_RUN_NUMBER
+
+    - name: Compile the crate
+      run:
+        docker run avr-rust/ruduino.ci:$GITHUB_RUN_NUMBER
+

Dockerfile.ci

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+FROM ubuntu:18.04
+
+RUN useradd -m avr-rust
+
+# Install dependencies
+RUN apt-get update -y && apt-get install -y wget gcc binutils gcc-avr avr-libc
+
+RUN mkdir -p /code && chown avr-rust:avr-rust /code
+
+USER avr-rust
+
+# Install Rustup along with nightly
+RUN wget -q https://sh.rustup.rs -O /tmp/rustup.sh && sh /tmp/rustup.sh -y --profile minimal --default-toolchain nightly -c rust-src --quiet
+ENV PATH=/home/avr-rust/.cargo/bin:$PATH
+
+COPY --chown=avr-rust:avr-rust . /code/ruduino
+
+WORKDIR /code/ruduino
+
+CMD ["cargo", "build", "-Z", "build-std=core", "--target", "avr-atmega328p.json", "--release"]

avr-atmega328p.json

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+{
+  "arch": "avr",
+  "cpu": "atmega328p",
+  "data-layout": "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8",
+  "env": "",
+  "executables": true,
+  "linker": "avr-gcc",
+  "linker-flavor": "gcc",
+  "linker-is-gnu": true,
+  "llvm-target": "avr-unknown-unknown",
+  "no-compiler-rt": true,
+  "os": "unknown",
+  "position-independent-executables": false,
+  "exe-suffix": ".elf",
+  "eh-frame-header": false,
+  "pre-link-args": {
+    "gcc": [
+      "-Os",
+      "-mmcu=atmega328p"
+    ]
+  },
+  "late-link-args": {
+    "gcc": [
+      "-lc",
+      "-lgcc"
+    ]
+  },
+  "target-c-int-width": "16",
+  "target-endian": "little",
+  "target-pointer-width": "16",
+  "vendor": "unknown"
+}