Add github actions

scripts/actions/build-linux.sh

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+#!/bin/bash
+
+set -e # fail on any error
+set -u # treat unset variables as error
+#strip ON
+export RUSTFLAGS=" -Clink-arg=-s -Ctarget-feature=+aes,+sse2,+ssse3"
+
+echo "_____ Build OpenEthereum and tools _____"
+
+time cargo build --verbose --color=always --release --features final
+time cargo build --verbose --color=always --release -p evmbin
+time cargo build --verbose --color=always --release -p ethstore-cli
+time cargo build --verbose --color=always --release -p ethkey-cli
+
+echo "_____ Post-processing binaries _____"
+rm -rf artifacts/*
+mkdir -p artifacts/
+
+cp -v target/release/parity artifacts/parity
+cp -v target/release/parity-evm artifacts/parity-evm
+cp -v target/release/ethstore artifacts/ethstore
+cp -v target/release/ethkey artifacts/ethkey

scripts/actions/build-windows.sh

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+#!/bin/bash
+set -e # fail on any error
+set -u # treat unset variables as error
+# NOTE: Enables the aes-ni instructions for RustCrypto dependency.
+# If you change this please remember to also update .cargo/config
+export RUSTFLAGS=" -Ctarget-feature=+aes,+sse2,+ssse3 -Ctarget-feature=+crt-static  -Clink-arg=-s"
+
+echo "_____ Build Parity and tools _____"
+time cargo build --verbose --release --features final
+time cargo build --verbose --release -p evmbin
+time cargo build --verbose --release -p ethstore-cli
+time cargo build --verbose --release -p ethkey-cli
+
+echo "_____ Post-processing binaries _____"
+rm -rf artifacts
+mkdir -p artifacts
+
+cp --verbose target/release/parity.exe artifacts/parity.exe
+cp --verbose target/release/parity-evm.exe artifacts/parity-evm.exe
+cp --verbose target/release/ethstore.exe artifacts/ethstore.exe
+cp --verbose target/release/ethkey.exe artifacts/ethkey.exe

scripts/actions/clean-target.sh

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+#!/bin/bash
+
+set -e # fail on any error
+set -u # treat unset variables as error
+
+find ./target/release -maxdepth 1 -type f -delete;
+rm -fr ./target/release/{deps,.fingerprint}/*{parity,ethcore,ethkey,ethstore,parity-evm}*;
+rm -f  ./target/.rustc_info.json;

scripts/actions/install-sccache.ps1

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+#!/usr/bin/env pwsh
+$os=$args[0]
+$version="0.2.12"
+echo "Current OS:" $os
+switch ($os){
+   "macOS" {$platform = "x86_64-apple-darwin"}
+   "Linux" {$platform = "x86_64-unknown-linux-musl"}
+   "Windows"  {$platform ="x86_64-pc-windows-msvc"}
+}
+echo "Target arch: " $platform
+$basename = "sccache-$version-$platform"
+$url = "https://github.com/mozilla/sccache/releases/download/"+"$version/$basename.tar.gz"
+echo "Download sccache from "+$url
+curl -LO $url
+tar -xzvf "$basename.tar.gz"
+ls $basename/
+. $basename/sccache --start-server
+echo "::add-path::$(pwd)/$basename"
+echo "::set-env name=RUSTC_WRAPPER::sccache"

scripts/actions/validate-chainspecs.sh

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+#!/bin/bash
+set -e # fail on any error
+set -u # treat unset variables as error
+echo "________Running validate_chainspecs.sh________"
+
+ERR=0
+
+echo "________Validate chainspecs________"
+time cargo build --release -p chainspec --verbose --color=always
+
+for spec in ethcore/res/*.json; do
+    if ! ./target/release/chainspec "$spec"; then ERR=1; fi
+done
+
+for spec in ethcore/res/ethereum/*.json; do
+    if ! ./target/release/chainspec "$spec"; then ERR=1; fi
+done
+#show sccache statistics
+sccache --stop-server
+exit $ERR