fix gemspec and add build CI

.github/workflows/build.yaml

@@ -0,0 +1,42 @@
+name: Build
+
+on:
+  push:
+    tags: ["*-rc*"]
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby-version:
+        - "2.6"
+        toolchain:
+        - "stable"
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+    - name: Set up Rust
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: ${{ matrix.toolchain }}
+        default: true
+    - name: Set LD_LIBRARY_PATH
+      run: echo LD_LIBRARY_PATH=$(ruby -e 'print RbConfig::CONFIG["libdir"]') >> $GITHUB_ENV
+    - name: Set up Cargo cache
+      uses: actions/cache@v3
+      with:
+        path: ~/.cargo
+        key: cargo-cache-${{ steps.rust-toolchain.outputs.rustc_hash }}-${{ hashFiles('ext/datafusion_ruby/Cargo.lock') }}
+    - name: Build
+      run: make build
+    - name: Archive Artifact
+      uses: actions/upload-artifact@v3
+      with:
+        path: "*.gem"
+        # name: "arrow-datafusion-x.y.z.gem"

Makefile

@@ -1,6 +1,12 @@
 install:
 	bundle install
 
+build:
+	gem build *.gemspec
+
+publish:
+	gem push *.gem
+
 test:
 	cd ext/datafusion_ruby && rake
 	bundle exec rspec

arrow-datafusion.gemspec

@@ -8,15 +8,16 @@ Gem::Specification.new do |spec|
 
   spec.summary = "Ruby bindings of Apache Arrow Datafusion"
   spec.description =
-    "DataFusion is an extensible query execution framework, written in Rust, that uses Apache Arrow as its in-memory format."
+    "Ruby bindings of Apache Arrow Datafusion"
   spec.license = "Apache-2.0"
 
   spec.files = ["README.md", "#{spec.name}.gemspec", "LICENSE"]
-  spec.files += Dir.glob("ext/datafusion/src/**/*.rs")
-  spec.files += ["ext/datafusion/Rakefile", "ext/datafusion/Cargo.toml", "ext/datafusion/Cargo.lock"]
+  spec.files += Dir.glob("ext/datafusion_ruby/src/**/*.rs")
+  spec.files += ["ext/datafusion_ruby/Rakefile", "ext/datafusion_ruby/Cargo.toml", "ext/datafusion_ruby/Cargo.lock"]
   spec.files += Dir.glob("lib/**/*.rb")
-  spec.extensions = ["ext/datafusion/Rakefile"]
+  spec.extensions = ["ext/datafusion_ruby/Rakefile"]
 
   # actually a build time dependency, but that's not an option.
   spec.add_runtime_dependency "rake", "> 1"
+  spec.required_ruby_version = ">= 2.6.0"
 end