CI: Add Github actions

.github/workflows/ci.yml

@@ -0,0 +1,81 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  job_test_gem:
+    name: Test built gem
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: windows
+            ruby: "head"
+            PGVERSION: 15.1-1-windows-x64
+            PGVER: "15"
+          - os: windows
+            ruby: "2.4"
+            PGVERSION: 9.4.26-1-windows-x64
+            PGVER: "9.4"
+          - os: ubuntu
+            ruby: "head"
+            PGVER: "15"
+          - os: ubuntu
+            os_ver: "20.04"
+            ruby: "2.3"
+            PGVER: "9.3"
+          - os: macos
+            ruby: "head"
+            PGVERSION: 15.1-1-osx
+            PGVER: "15"
+
+    runs-on: ${{ matrix.os }}-${{ matrix.os_ver || 'latest' }}
+    env:
+      PGVERSION: ${{ matrix.PGVERSION }}
+      PGVER: ${{ matrix.PGVER }}
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+
+      - name: Download PostgreSQL Windows
+        if: matrix.os == 'windows'
+        run: |
+          Add-Type -AssemblyName System.IO.Compression.FileSystem
+          function Unzip {
+              param([string]$zipfile, [string]$outpath)
+              [System.IO.Compression.ZipFile]::ExtractToDirectory($zipfile, $outpath)
+          }
+
+          $(new-object net.webclient).DownloadFile("http://get.enterprisedb.com/postgresql/postgresql-$env:PGVERSION-binaries.zip", "postgresql-binaries.zip")
+          Unzip "postgresql-binaries.zip" "."
+          echo "$pwd/pgsql/bin"  | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append
+          echo "PGUSER=$env:USERNAME"  | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+          echo "PGPASSWORD="  | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+          md temp
+          icacls temp /grant "Everyone:(OI)(CI)F" /T
+
+      - name: Download PostgreSQL Ubuntu
+        if: matrix.os == 'ubuntu'
+        run: |
+          echo "deb http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -cs)-pgdg main $PGVER" | sudo tee -a /etc/apt/sources.list.d/pgdg.list
+          wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
+          sudo apt-get -y update
+          sudo apt-get -y --allow-downgrades install postgresql-$PGVER libpq5=$PGVER* libpq-dev=$PGVER*
+          echo /usr/lib/postgresql/$PGVER/bin >> $GITHUB_PATH
+
+      - name: Download PostgreSQL Macos
+        if: matrix.os == 'macos'
+        run: |
+          wget https://get.enterprisedb.com/postgresql/postgresql-$PGVERSION-binaries.zip && \
+          sudo mkdir -p /Library/PostgreSQL && \
+          sudo unzip postgresql-$PGVERSION-binaries.zip -d /Library/PostgreSQL/$PGVER && \
+          echo /Library/PostgreSQL/$PGVER/bin >> $GITHUB_PATH
+
+      - run: bundle install
+
+      - name: Run specs
+        run: bundle exec rake test