added Action metadata

Dockerfile

@@ -11,6 +11,17 @@ RUN dotnet build CodeCoverageSummary/CodeCoverageSummary.csproj -c Release -o /a
 FROM build AS publish
 RUN dotnet publish CodeCoverageSummary/CodeCoverageSummary.csproj -c Release -o /app/publish
 
+# Label the container
+LABEL maintainer="Irongut <murray.dave@outlook.com>"
+LABEL repository="https://github.com/irongut/CodeCoverageSummary"
+LABEL homepage="https://github.com/irongut/CodeCoverageSummary"
+
+# Label as GitHub Action
+LABEL com.github.actions.name="Code Coverage Summary"
+LABEL com.github.actions.description="A GitHub Action that reads Cobertura format code coverage files and outputs a summary."
+LABEL com.github.actions.icon="book-open"
+LABEL com.github.actions.color="purple"
+
 FROM base AS final
 WORKDIR /app
 COPY --from=publish /app/publish .

action.yml

@@ -0,0 +1,31 @@
+name: 'Code Coverage Summary'
+author: 'Irongut <murray.dave@outlook.com>'
+description: 'A GitHub Action that reads Cobertura format code coverage files and outputs a summary.'
+branding:
+  icon: book-open
+  color: purple
+inputs:
+  filename:
+    description: 'Code coverage file to analyse.'
+    required: true
+    default: ''
+  badge:
+    description: 'Include a badge in the output - true / false (default).'
+    required: false
+  format:
+    description: 'Output Format - markdown or text (default).'
+    required: false
+  output:
+    description: 'Output Type - console (default), file or both.'
+    required: false
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.filename }}
+    - '--badge'
+    - ${{ inputs.badge }}
+    - '--format'
+    - ${{ inputs.format }}
+    - '--output'
+    - ${{ inputs.output }}