Add GitHub action

.dockerignore

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 .github/
 .ruby-lsp/
 .vscode/
+action/
 .editorconfig
 .env
 .env.example

action/Dockerfile

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+FROM ghcr.io/spenserblack/github-polyglot:v0.1.0-rc.2
+COPY entrypoint.sh /entrypoint.sh
+ENTRYPOINT [ "/entrypoint.sh" ]

action/README.md

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+# GitHub Polyglot action
+
+This action runs the `github-polyglot` gem in a Docker container.
+
+## Inputs
+
+### `token`
+
+Optional. GitHub API token to avoid rate limits when scanning repository language details.
+
+### `user`
+
+Optional. The user to collect data for. Defaults to the owner of the repository that is running
+the action.
+
+### `format`
+
+Optional. The format of the output. Defaults to `print` (a display format for terminal display).
+
+## Outputs
+
+### `output`
+
+The output of the `github-polyglot` gem.
+
+## Example
+
+```yaml
+# ...
+steps:
+- uses: spenserblack/github-polyglot/action@main
+  id: github-polyglot
+  with:
+    token: ${{ secrets.PAT }}
+    format: svg
+- name: Create language stats image
+  env:
+    SVG: ${{ steps.github-polyglot.outputs.output }}
+  run: echo "$SVG" > language-stats.svg
+  # Commit the SVG with your favorite commands or actions
+```

action/action.yml

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+name: GitHub Polyglot
+description: Compile language statistics for a GitHub user
+branding:
+  icon: code
+  color: orange
+inputs:
+  token:
+    description: The GitHub token for the API
+    required: false
+  user:
+    description: The user to analyze
+    required: true
+    default: ${{ github.repository_owner }}
+  format:
+    description: The format of the output
+    required: true
+    default: print
+outputs:
+  output:
+    description: The output of the executable
+runs:
+  using: docker
+  image: Dockerfile
+  env:
+    GITHUB_TOKEN: ${{ inputs.token }}
+  args:
+    - "--user"
+    - ${{ inputs.user }}
+    - "--format"
+    - ${{ inputs.format }}

action/entrypoint.sh

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+#!/bin/sh -l
+OUTPUT="$(github-polyglot "$@")"
+# NOTE: We still want to show the output to the user, which can be helpful if the user is using
+#       the `print` format and just wants to see the output in the action log.
+echo -n "$OUTPUT"
+# NOTE: Save the output to the `output` output of the action
+echo -n "output=$OUTPUT" >> $GITHUB_OUTPUT