Chore: Making the plugin install commands respect the config parameter (#86578)

Currently the grafana cli plugin commands are not reacting to the --config parameter. This PR make it possible to use config to define the plugin endpoints via config as an alternative to providing the --repo flag.

pkg/cmd/grafana-cli/utils/command_line.go

@@ -1,9 +1,14 @@
 package utils
 
 import (
+	"slices"
+	"strings"
+
 	"github.com/urfave/cli/v2"
 
+	"github.com/grafana/grafana/pkg/cmd/grafana-cli/logger"
 	"github.com/grafana/grafana/pkg/cmd/grafana-cli/models"
+	"github.com/grafana/grafana/pkg/setting"
 )
 
 type CommandLine interface {
@@ -52,7 +57,38 @@ func (c *ContextCommandLine) PluginDirectory() string {
 	return c.String("pluginsDir")
 }
 
+/*
+The plugin repository URL is determined in the following order:
+1. --repo flag value if it is specified
+2. --repo flag value if set via the environment variable called "GF_PLUGIN_REPO"
+3. --configOverrides parameter (only if --config is set too)
+4. --config parameter, from which we are looking at GrafanaComAPIURL setting
+5. fallback to default value which is https://grafana.com/api/plugins
+**/
+
 func (c *ContextCommandLine) PluginRepoURL() string {
+	// if --repo flag is set, use it
+	// since the repo flag always has a value set by default we are checking in the flag lists if the --repo flag was provided at all.
+	if slices.Contains(c.FlagNames(), "repo") {
+		return c.String("repo")
+	}
+
+	// if --config flag is set, try to get the GrafanaComAPIURL setting
+	if c.ConfigFile() != "" {
+		configOptions := strings.Split(c.String("configOverrides"), " ")
+		cfg, err := setting.NewCfgFromArgs(setting.CommandLineArgs{
+			Config:   c.ConfigFile(),
+			HomePath: c.HomePath(),
+			Args:     append(configOptions, c.Args().Slice()...),
+		})
+
+		if err != nil {
+			logger.Debug("Could not parse config file", err)
+		} else if cfg.GrafanaComAPIURL != "" {
+			return cfg.GrafanaComAPIURL + "/plugins"
+		}
+	}
+	// fallback to default value
 	return c.String("repo")
 }