feat: github actions #440 (#444)

feat: add github actions yaml file that uses a custom made docker image to build the code and run the unit tests #440

Author: brandonpille

.github/workflows/README.md

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+# Workflows
+This page contains some documentation on the workflows for this repository.
+
+## build_test
+The workflow build_test is used to build and test the code (see build_test.yaml). We are using a custom docker image for building and testing the code. You can find the image on our [Docker Hub](https://hub.docker.com/repository/docker/threefolddev/tfchain). The dockerfile build_test.Dockerfile was used to build that image. If the image no longer meets the expectations please follow these steps:
+
+1) Update the dockerfile as required (add what you need)
+2) Build the new image (execute the comment with .github/workflows as working directory and make sure to increment the version):
+    > docker build -t threefolddev/tfchain:\<VERSION> -f build_test.Dockerfile .
+3) Make sure to test the pipeline manually using the docker image that you build
+    > docker run --it -rm threefolddev/tfchain:\<VERSION> \
+    > // clone the repository, build and test tfchain
+4) Upload the image (you will need the credentials):
+    > docker login
+    > docker push threefolddev/tfchain:\<VERSION>
+5) Update the pipeline on the repository https://github.com/threefoldtech/tfchain under .github/workflows to use this new image
+6) Push your changes, create a PR and let the pipeline run. If it fails due to changes to the image you should start over the steps.
+7) Once the PR is landed please tag the repository so that we can trace back the dockerfile given the version:
+    > git tag -a dockerfile-build-v\<VERSION> -m "new dockerfile version \<VERSION>"
+

.github/workflows/build_test.Dockerfile

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+FROM ubuntu:20.04
+ENV DEBIAN_FRONTEND=noninteractive
+COPY clean_disk_space.sh clean_disk_space.sh
+RUN apt-get update && \
+    apt-get install -y \
+        build-essential \
+        clang \
+        cmake \
+        curl \
+        git \
+        librocksdb-dev \
+        libclang-dev \
+        lld \
+        lldb \
+        python3 \
+        python3-pip \
+        tar \
+        zstd && \
+    curl https://sh.rustup.rs -sSf | sh -s -- -y && \
+    $HOME/.cargo/bin/rustup install nightly-2022-05-11 && \
+    # cleanup image 
+    rm -rf /var/lib/apt/lists/* && \
+    apt-get clean && \
+    apt-get autoclean && \
+    apt-get autoremove && \
+    rm -rf /tmp/* 
+RUN /bin/bash

.github/workflows/build_test.yaml

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+name: Build and Test
+on: 
+  push:
+    branches:
+      - development
+  pull_request:
+jobs:
+  build-and-test:
+    runs-on: [self-hosted, poc]
+    container:
+      image: threefolddev/tfchain:0
+      env:
+        DEBIAN_FRONTEND: noninteractive
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Cache build
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            substrate-node/target/
+          key: ${{ runner.os }}-tfchain-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: ${{ runner.os }}-tfchain-cargo-
+
+ 
+      - name: Build
+        run: |
+          cd substrate-node
+          $HOME/.cargo/bin/rustup target add wasm32-unknown-unknown --toolchain nightly-2022-05-11
+          $HOME/.cargo/bin/cargo +nightly-2022-05-11 build --release
+
+      - name: Unit tests
+        run: |
+          cd substrate-node
+          $HOME/.cargo/bin/cargo +nightly-2022-05-11 test --no-fail-fast
+          cd pallets
+          $HOME/.cargo/bin/cargo +nightly-2022-05-11 test --no-fail-fast