Add support for arm-linux

and ensure test coverage in the CI pipeline

Author: flavorjones

Diff for: .github/workflows/gem-install.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        platform: ["ruby", "x64-mingw32", "x64-mingw-ucrt", "x86_64-darwin", "x86_64-linux"]
+        platform: ["ruby", "x64-mingw32", "x64-mingw-ucrt", "x86_64-darwin", "x86_64-linux", "arm-linux"]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
@@ -79,6 +79,24 @@ jobs:
       - run: "gem install pkg/tailwindcss-rails-*.gem"
       - run: "tailwindcss --help"
 
+  linux-arm-install:
+    needs: ["package"]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/download-artifact@v3
+        with:
+          name: gem-arm-linux
+          path: pkg
+      - run: find pkg
+      - run: docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+      - run: |
+          docker run --rm -v "$(pwd):/test" -w /test --platform=linux/arm/v7 ruby:3.1 \
+            /bin/bash -c "
+              set -ex
+              gem install pkg/tailwindcss-rails-*.gem
+              tailwindcss --help
+            "
+
   darwin-install:
     needs: ["package"]
     runs-on: macos-latest

Diff for: lib/tailwindcss/upstream.rb

@@ -11,6 +11,7 @@ module Upstream
       "x86_64-darwin" => "tailwindcss-macos-x64",
       "x86_64-linux" => "tailwindcss-linux-x64",
       "aarch64-linux" => "tailwindcss-linux-arm64",
+      "arm-linux" => "tailwindcss-linux-armv7",
     }
   end
 end