ci: Add Jenkins configuration and related files

ci/Dockerfile

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+FROM rust:1.65.0-slim-bullseye
+
+LABEL maintainer="augustinas@status.im"
+LABEL source="https://github.com/logos-co/Overwatch"
+LABEL description="Overwatch ci build image"
+
+# Using backports for go 1.19
+RUN echo 'deb http://deb.debian.org/debian bullseye-backports main' >> /etc/apt/sources.list
+
+# Dependecies for publishing documentation and building waku-bindings.
+RUN apt-get update && apt-get install -yq \
+    openssh-client git clang \
+    golang-src/bullseye-backports \
+    golang-doc/bullseye-backports \
+    golang/bullseye-backports
+
+RUN rustup component add rustfmt clippy
+
+# Jenkins user needs a specific UID/GID to work.
+RUN groupadd -g 1001 jenkins \
+ && useradd -u 1001 -g jenkins jenkins

ci/Jenkinsfile.prs.linux

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+pipeline {
+  agent {
+    dockerfile {
+      label 'linux'
+      dir 'ci'
+    }
+  }
+
+  environment {
+    GOPATH  = '/tmp/go'
+    GOCACHE = '/tmp/'
+  }
+
+  options {
+    disableConcurrentBuilds()
+    buildDiscarder(logRotator(
+      numToKeepStr: '20',
+      daysToKeepStr: '30',
+    ))
+  }
+
+  stages {
+    stage('Check') {
+      steps {
+      	sh 'cargo check --all --all-features'
+      	sh 'cargo fmt -- --check'
+	sh 'cargo clippy --all --all-features -- --deny warnings'
+      }
+    }
+
+    stage('Build') {
+      steps {
+        sh 'cargo build --all --all-features'
+      }
+    }
+
+    stage('Test') {
+      steps {
+        sh 'cargo test --all --all-features'
+      }
+    }
+  }
+  post {
+    cleanup { cleanWs() }
+  }
+}

ci/Jenkinsfile.prs.macos

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+library 'status-jenkins-lib@v1.6.0'
+
+pipeline {
+  agent {
+    label 'macos && x86_64'
+  }
+
+  environment {
+    GOPATH  = '/tmp/go'
+    GOCACHE = '/tmp/'
+  }
+
+  options {
+    disableConcurrentBuilds()
+    buildDiscarder(logRotator(
+      numToKeepStr: '20',
+      daysToKeepStr: '30',
+    ))
+  }
+
+  stages {
+    stage('Check') {
+      steps { script {
+      	nix.shell('cargo check --all --all-features')
+      	nix.shell('cargo fmt -- --check')
+	nix.shell('cargo clippy --all --all-features -- --deny warnings')
+      } }
+    }
+
+    stage('Build') {
+      steps { script {
+        nix.shell('cargo build --all --all-features')
+      } }
+    }
+
+    stage('Test') {
+      steps { script {
+        nix.shell('cargo test --all --all-features')
+      } }
+    }
+  }
+  post {
+    cleanup { cleanWs() }
+  }
+}

ci/README.md

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+# Building `Overwatch` with Jenkins
+
+This is a short introduction for developers on how to use `ci` folder to update build dependencies or to modify the build process.
+
+## ci/Dockerfile (Docs, linux target)
+
+Dockerfile is used when `Overwatch` documentation is being built and to lint/test/build for linux target. Official rust image is used with a predefined version. In addition, golang and cargo components are downloaded when the image is being built.
+In general, this file should be used just for defining dependencies. Related steps and build commands for linux target should be defined in `ci/Jenkinsfile.prs.linux`.
+
+## ci/Jenkinsfile.prs.linux
+
+Two most important places in this file are `environment` and `stages`.
+* `environment` - variables defined here will be accessible to every stage that runs on an image built from the `ci/Dockerfile`
+* `stages` - used to group shell commands that are related to different steps and their layout reflects in the build job summary.
+
+## ci/Jenkinsfile.prs.macos
+
+Same as in `Jenkinsfile.prs.macos` the only difference is that instead of Docker image, macos is using `shell.nix` to build a shell with all dependencies. The steps defined here should be identical or similar to what's defined in linux file, just instead of running those commands straight in `sh`, use `nix.shell('command')` wrapper.
+
+## shell.nix
+
+Configuration file for the Nix package manager. It defines the build dependencies for `macos` target and can be used to manage and update the dependencies similarly to Dockerfile.

shell.nix

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+{ pkgs ? import <nixpkgs> {
+    builtins = [(import (fetchTarball {
+      url    = "https://github.com/NixOS/nixpkgs/archive/3389f23412877913b9d22a58dfb241684653d7e9.tar.gz";
+      sha256 = "sha256:0wgm7sk9fca38a50hrsqwz6q79z35gqgb9nw80xz7pfdr4jy9pf8";
+    }))];
+    overlays = [
+      (import (fetchGit {
+        url = "https://github.com/oxalica/rust-overlay.git";
+	rev = "fe185fac76e009b4bd543704a8c61077cf70155b";
+      }))
+    ];
+   }
+}:
+
+pkgs.mkShell {
+  name = "overwatch-build-shell";
+
+  buildInputs = with pkgs; [
+    pkg-config
+    rust-bin.stable."1.65.0".default
+    go_1_19
+  ];
+}