chore: remove some panics

It'll only error if the flag doesn't exist, which is not that bad, so
I just removed the panics for now... like the other options set the same
way.

internal/cmd/init.go

@@ -22,7 +22,7 @@ func newInitCmd() *initCmd {
 		SilenceErrors:     true,
 		Args:              cobra.NoArgs,
 		ValidArgsFunction: cobra.NoFileCompletions,
-		RunE: func(cmd *cobra.Command, args []string) error {
+		RunE: func(_ *cobra.Command, _ []string) error {
 			if err := os.WriteFile(root.config, []byte(example), 0o666); err != nil {
 				return fmt.Errorf("failed to create example file: %w", err)
 			}
@@ -31,9 +31,7 @@ func newInitCmd() *initCmd {
 	}
 
 	cmd.Flags().StringVarP(&root.config, "config", "f", "nfpm.yaml", "path to the to-be-created config file")
-	if err := cmd.MarkFlagFilename("config", "yaml", "yml"); err != nil {
-		panic(err)
-	}
+	_ = cmd.MarkFlagFilename("config", "yaml", "yml")
 
 	root.cmd = cmd
 	return root

internal/cmd/package.go

@@ -34,17 +34,14 @@ func newPackageCmd() *packageCmd {
 	}
 
 	cmd.Flags().StringVarP(&root.config, "config", "f", "nfpm.yaml", "config file to be used")
-	if err := cmd.MarkFlagFilename("config", "yaml", "yml"); err != nil {
-		panic(err)
-	}
+	_ = cmd.MarkFlagFilename("config", "yaml", "yml")
 	cmd.Flags().StringVarP(&root.target, "target", "t", "", "where to save the generated package (filename, folder or empty for current folder)")
-	if err := cmd.MarkFlagFilename("target"); err != nil {
-		panic(err)
-	}
+	_ = cmd.MarkFlagFilename("target")
 	cmd.Flags().StringVarP(&root.packager, "packager", "p", "", "which packager implementation to use [apk|deb|rpm|archlinux]")
-	if err := cmd.RegisterFlagCompletionFunc("packager", cobra.FixedCompletions([]string{"apk", "deb", "rpm", "archlinux"}, cobra.ShellCompDirectiveNoFileComp)); err != nil {
-		panic(err)
-	}
+	_ = cmd.RegisterFlagCompletionFunc("packager", cobra.FixedCompletions(
+		[]string{"apk", "deb", "rpm", "archlinux"},
+		cobra.ShellCompDirectiveNoFileComp,
+	))
 
 	root.cmd = cmd
 	return root

internal/cmd/schema.go

@@ -48,9 +48,7 @@ func newSchemaCmd() *schemaCmd {
 	}
 
 	cmd.Flags().StringVarP(&root.output, "output", "o", "-", "where to save the json schema")
-	if err := cmd.MarkFlagFilename("output", "json"); err != nil {
-		panic(err)
-	}
+	_ = cmd.MarkFlagFilename("output", "json")
 
 	root.cmd = cmd
 	return root