Explicitly run Github Actions in Ubuntu 16 and 18

.github/workflows/build-and-test-macos.yml

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+name: Github Autobuild macOS
+on: [ push, pull_request ]
+env:
+  CCACHE_COMPRESS: exists means true
+  CCACHE_SLOPPINESS: include_file_ctime,include_file_mtime,time_macros
+jobs:
+  test-macos:
+    name: Build and run tests in macOS
+    runs-on: macos-latest
+    steps:
+    - name: Install dependencies
+      run: |
+        brew install autoconf automake libtool
+        brew install ccache
+        brew search boost
+        brew install bitshares/boost/[email protected]
+    - uses: actions/checkout@v2
+      with:
+        submodules: recursive
+    - name: Configure
+      run: |
+        mkdir -p _build
+        pushd _build
+        cmake -D CMAKE_BUILD_TYPE=Release \
+              -D CMAKE_C_COMPILER_LAUNCHER=ccache \
+              -D CMAKE_CXX_COMPILER_LAUNCHER=ccache \
+              -D BOOST_ROOT=/usr/local/opt/[email protected] \
+              -D OPENSSL_ROOT_DIR=/usr/local/opt/openssl \
+              ..
+        popd
+    - name: Load Cache
+      uses: actions/cache@v1
+      with:
+        path: ccache
+        key: ccache-osx-${{ github.ref }}-${{ github.sha }}
+        restore-keys: |
+          ccache-osx-${{ github.ref }}-
+          ccache-osx-
+    - name: Build
+      run: |
+        export CCACHE_DIR="$GITHUB_WORKSPACE/ccache"
+        mkdir -p "$CCACHE_DIR"
+        make -j 2 -C _build
+        df -h
+    - name: Unit-Tests
+      run: |
+        pushd _build/tests
+        ./all_tests -l message
+        ./bloom_test -- README.md
+        ./ecc_test README.md
+        ./hmac_test
+        ./task_cancel_test

.github/workflows/build-and-test-ubuntu-debug.yml

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+name: Github Autobuild Ubuntu Debug
+on: [ push, pull_request ]
+env:
+  CCACHE_COMPRESS: exists means true
+  CCACHE_SLOPPINESS: include_file_ctime,include_file_mtime,time_macros
+jobs:
+  test-debug:
+    name: Build and run tests in Debug mode
+    strategy:
+      matrix:
+        os: [ ubuntu-16.04, ubuntu-18.04 ]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Install dependencies
+      run: |
+        sudo apt-get update
+        openssl_ver=`sudo apt-cache madison openssl | grep xenial-updates | awk '{print $3}'`
+        libssl_ver=`sudo apt-cache madison libssl-dev | grep xenial-updates | awk '{print $3}'`
+        [ -n "${openssl_ver}" ] && [ -n "${libssl_ver}" ] && \
+          sudo apt-get install -y --allow-downgrades openssl=${openssl_ver} libssl-dev=${libssl_ver}
+        sudo apt-get install -y \
+                     ccache \
+                     parallel \
+                     libboost-thread-dev \
+                     libboost-iostreams-dev \
+                     libboost-date-time-dev \
+                     libboost-system-dev \
+                     libboost-filesystem-dev \
+                     libboost-program-options-dev \
+                     libboost-chrono-dev \
+                     libboost-test-dev \
+                     libboost-context-dev \
+                     libboost-regex-dev \
+                     libboost-coroutine-dev
+    - uses: actions/checkout@v1
+      with:
+        submodules: recursive
+    - name: Configure
+      run: |
+        mkdir -p _build
+        pushd _build
+        export -n BOOST_ROOT BOOST_INCLUDEDIR BOOST_LIBRARYDIR
+        cmake -D CMAKE_BUILD_TYPE=Debug \
+              -D CMAKE_CXX_OUTPUT_EXTENSION_REPLACE=ON \
+              -D CMAKE_C_COMPILER=gcc \
+              -D CMAKE_C_COMPILER_LAUNCHER=ccache \
+              -D CMAKE_CXX_COMPILER=g++ \
+              -D CMAKE_CXX_COMPILER_LAUNCHER=ccache \
+              ..
+        popd
+    - name: Load Cache
+      uses: actions/cache@v1
+      with:
+        path: ccache
+        key: ccache-debug-${{ github.ref }}-${{ github.sha }}
+        restore-keys: |
+          ccache-debug-${{ github.ref }}-
+          ccache-debug-
+          ccache-
+    - name: Build
+      run: |
+        export CCACHE_DIR="$GITHUB_WORKSPACE/ccache"
+        mkdir -p "$CCACHE_DIR"
+        make -j 2 -C _build
+    - name: Test
+      run: |
+        parallel echo Running {}\; sh -c "_build/tests/{}" <<_EOT_
+        all_tests -l message
+        bloom_test -- README.md
+        ecc_test README.md
+        hmac_test
+        task_cancel_test
+        _EOT_

.github/workflows/build-and-test-ubuntu-release.yml

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+name: Github Autobuild Ubuntu Release
+on: [ push, pull_request ]
+env:
+  CCACHE_COMPRESS: exists means true
+  CCACHE_SLOPPINESS: include_file_ctime,include_file_mtime,time_macros
+jobs:
+  test-release:
+    name: Build and run tests in Release mode
+    strategy:
+      matrix:
+        os: [ ubuntu-16.04, ubuntu-18.04 ]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Install dependencies
+      run: |
+        sudo apt-get update
+        openssl_ver=`sudo apt-cache madison openssl | grep xenial-updates | awk '{print $3}'`
+        libssl_ver=`sudo apt-cache madison libssl-dev | grep xenial-updates | awk '{print $3}'`
+        [ -n "${openssl_ver}" ] && [ -n "${libssl_ver}" ] && \
+          sudo apt-get install -y --allow-downgrades openssl=${openssl_ver} libssl-dev=${libssl_ver}
+        sudo apt-get install -y \
+                     ccache \
+                     parallel \
+                     libboost-thread-dev \
+                     libboost-iostreams-dev \
+                     libboost-date-time-dev \
+                     libboost-system-dev \
+                     libboost-filesystem-dev \
+                     libboost-program-options-dev \
+                     libboost-chrono-dev \
+                     libboost-test-dev \
+                     libboost-context-dev \
+                     libboost-regex-dev \
+                     libboost-coroutine-dev
+    - uses: actions/checkout@v1
+      with:
+        submodules: recursive
+    - name: Configure
+      run: |
+        mkdir -p _build
+        pushd _build
+        export -n BOOST_ROOT BOOST_INCLUDEDIR BOOST_LIBRARYDIR
+        cmake -D CMAKE_BUILD_TYPE=Release \
+              -D CMAKE_CXX_OUTPUT_EXTENSION_REPLACE=ON \
+              -D CMAKE_C_COMPILER=gcc \
+              -D CMAKE_C_COMPILER_LAUNCHER=ccache \
+              -D CMAKE_CXX_COMPILER=g++ \
+              -D CMAKE_CXX_COMPILER_LAUNCHER=ccache \
+              ..
+        popd
+    - name: Load Cache
+      uses: actions/cache@v1
+      with:
+        path: ccache
+        key: ccache-release-${{ github.ref }}-${{ github.sha }}
+        restore-keys: |
+          ccache-release-${{ github.ref }}-
+          ccache-release-
+          ccache-
+    - name: Build
+      run: |
+        export CCACHE_DIR="$GITHUB_WORKSPACE/ccache"
+        mkdir -p "$CCACHE_DIR"
+        make -j 2 -C _build
+    - name: Test
+      run: |
+        parallel echo Running {}\; sh -c "_build/tests/{}" <<_EOT_
+        all_tests -l message
+        bloom_test -- README.md
+        ecc_test README.md
+        hmac_test
+        task_cancel_test
+        _EOT_