Fix handling of owner/repository to support GitHub Actions

Fix the handling of owner/repository input as so to support the
github.repository context which is provided for GitHub Actions in the
runner (separate owner and repo values are not provided and string
manipulation is not easy inside Actions).

action.yaml

@@ -44,6 +44,8 @@ runs:
         GITHUB_TOKEN: ${{ github.token }}
       run: |-
         ${{ github.action_path }}/bin/pull-requester run \
+          --repository=${{ github.repository }} \
+          --number=${{ github.event.pull_request.number }} \
           --title-minimum=${{ inputs.title-minimum }} \
           --label-prefixes=${{ inputs.label-prefixes }}
           --label-prefixes-any=${{ inputs.label-prefixes-any }}

cmd/run.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"fmt"
+	"strings"
 
 	"github.com/n3tuk/action-pull-requester/internal/action"
 	"github.com/n3tuk/action-pull-requester/internal/github"
@@ -10,7 +11,6 @@ import (
 )
 
 var (
-	owner      string
 	repository string
 	number     int
 
@@ -29,10 +29,9 @@ var (
 )
 
 func init() {
-	runCmd.Flags().BoolVarP(&dryRun, "dry-run", "d", false, "Only show what actions would be taken")
-	runCmd.Flags().StringVarP(&owner, "owner", "o", "n3tuk", "The owner of the repository to check")
-	runCmd.Flags().StringVarP(&repository, "repository", "r", "action-pull-requester", "The name of the repository to check")
+	runCmd.Flags().StringVarP(&repository, "repository", "r", "n3tuk/action-pull-requester", "The name of the repository to check")
 	runCmd.Flags().IntVar(&number, "number", 0, "The number of the pull request to check")
+	runCmd.Flags().BoolVarP(&dryRun, "dry-run", "d", false, "Only show what actions would be taken")
 	runCmd.Flags().IntVar(&titleMinimum, "title-minimum", titleMinimum, "The minimum number of characters a title should contain")
 	runCmd.Flags().StringVar(&labelPrefixes, "label-prefixes", "", "A comma-separated list of label prefixes to check for on a pull request")
 	runCmd.Flags().BoolVar(&labelPrefixesAny, "label-prefixes-any", false, "Set that any label prefix can match to pass, rather than all")
@@ -46,7 +45,9 @@ func RunChecks(cmd *cobra.Command, args []string) error {
 		LabelPrefixesAny: labelPrefixesAny,
 	}
 
-	pr, err := github.NewPullRequest(logger, owner, repository, number)
+	repo := strings.Split(repository, "/")
+
+	pr, err := github.NewPullRequest(logger, repo[0], repo[1], number)
 	if err != nil {
 		return fmt.Errorf("failed to fetch the pull request: %w", err)
 	}