Fix: Failing to create template (#167)

The secret provided via argument (`-e` flag) [1] was losing the value before
listing the tools. This caused failures to connect to the MCP server.

The strategy now is to replace the secret value only when encoding the object
to generate the template.

There was also a missing `--load` flag when executing `docker buildx build` to
correctly load the image into the memory.

[1] https://github.com/rafaeljusto/mcp-registry/blob/17fdb6eb0a4b47d4ac1a33535554a6fa7e2b2dd3/cmd/create/main.go#L177-L181

Author: rafaeljusto

cmd/build/main.go

@@ -128,7 +128,7 @@ func buildMcpImage(ctx context.Context, server servers.Server) error {
 	token := os.Getenv("GITHUB_TOKEN")
 
 	buildArgs := []string{
-		"-f", server.GetDockerfile(), "-t", "check", "-t", server.Image, "--label", "org.opencontainers.image.revision=" + sha,
+		"-f", server.GetDockerfile(), "-t", "check", "-t", server.Image, "--label", "org.opencontainers.image.revision=" + sha, "--load",
 	}
 
 	if server.Source.BuildTarget != "" {

cmd/create/main.go

@@ -140,10 +140,10 @@ func run(ctx context.Context, buildURL, name, category, userProvidedImage string
 		token := os.Getenv("GITHUB_TOKEN")
 
 		if token != "" {
-			cmd = exec.CommandContext(ctx, "docker", "buildx", "build", "--secret", "id=GIT_AUTH_TOKEN", "-t", "check", "-t", tag, "--label", "org.opencontainers.image.revision="+sha, gitURL)
+			cmd = exec.CommandContext(ctx, "docker", "buildx", "build", "--secret", "id=GIT_AUTH_TOKEN", "-t", "check", "-t", tag, "--label", "org.opencontainers.image.revision="+sha, "--load", gitURL)
 			cmd.Env = []string{"GIT_AUTH_TOKEN=" + token, "PATH=" + os.Getenv("PATH")}
 		} else {
-			cmd = exec.CommandContext(ctx, "docker", "buildx", "build", "-t", "check", "-t", tag, "--label", "org.opencontainers.image.revision="+sha, gitURL)
+			cmd = exec.CommandContext(ctx, "docker", "buildx", "build", "-t", "check", "-t", tag, "--label", "org.opencontainers.image.revision="+sha, "--load", gitURL)
 			cmd.Env = []string{"PATH=" + os.Getenv("PATH")}
 		}
 
@@ -177,7 +177,7 @@ func run(ctx context.Context, buildURL, name, category, userProvidedImage string
 				secrets = append(secrets, servers.Secret{
 					Name:    secretName(name, parts[0]),
 					Env:     parts[0],
-					Example: "<" + parts[0] + ">",
+					Example: parts[1],
 				})
 			} else {
 				env = append(env, servers.Env{

pkg/servers/types.go

@@ -23,6 +23,8 @@ THE SOFTWARE.
 package servers
 
 import (
+	"encoding/json"
+
 	"gopkg.in/yaml.v3"
 )
 
@@ -48,6 +50,21 @@ type Secret struct {
 	Required *bool  `yaml:"required,omitempty" json:"required,omitempty"`
 }
 
+// secret is an alias used to drop encoding methods to avoid infinite recursion.
+type secret Secret
+
+func (s Secret) MarshalYAML() (any, error) {
+	a := secret(s)
+	a.Example = "<" + s.Env + ">"
+	return a, nil
+}
+
+func (s Secret) MarshalJSON() ([]byte, error) {
+	a := secret(s)
+	a.Example = "<" + s.Env + ">"
+	return json.Marshal(a)
+}
+
 type Env struct {
 	Name    string `yaml:"name" json:"name"`
 	Example any    `yaml:"example,omitempty" json:"example,omitempty"`