fix(dagger): rename debug parameter to avoid conflict with built-in flag

The `debug` parameter in AddRawEvidence and AddFileEvidence conflicts
with Dagger's built-in --debug global flag, causing "flag already exists"
errors at runtime. Rename to `debugMode` (exposed as --debug-mode) to
avoid the collision. Both --debug and --verbose are reserved by Dagger,
so debugMode is used instead.

Assisted-by: Claude Code
Signed-off-by: Javier Rodriguez <javier@chainloop.dev>

Chainloop-Trace-Sessions: a8191e8b-5f3a-461b-a872-b312af60a7fb

Author: javirln

extras/dagger/main.go

@@ -394,9 +394,9 @@ func (att *Attestation) AddRawEvidence(
 	// Skip strict schema validation for structured materials (SBOM_CYCLONEDX_JSON, OPENAPI_SPEC, ASYNCAPI_SPEC)
 	// +optional
 	noStrictValidation bool,
-	// Enable debug/verbose logging
+	// Enable debug logging
 	// +optional
-	debug bool,
+	debugMode bool,
 ) (*Attestation, error) {
 	args := []string{
 		"attestation", "add",
@@ -426,7 +426,7 @@ func (att *Attestation) AddRawEvidence(
 		args = append(args, "--no-strict-validation")
 	}
 
-	if debug {
+	if debugMode {
 		args = append(args, "--debug")
 	}
 
@@ -458,9 +458,9 @@ func (att *Attestation) AddFileEvidence(
 	// Skip strict schema validation for structured materials (SBOM_CYCLONEDX_JSON, OPENAPI_SPEC, ASYNCAPI_SPEC)
 	// +optional
 	noStrictValidation bool,
-	// Enable debug/verbose logging
+	// Enable debug logging
 	// +optional
-	debug bool,
+	debugMode bool,
 ) (*Attestation, error) {
 	filename, err := path.Name(ctx)
 	if err != nil {
@@ -497,7 +497,7 @@ func (att *Attestation) AddFileEvidence(
 		args = append(args, "--no-strict-validation")
 	}
 
-	if debug {
+	if debugMode {
 		args = append(args, "--debug")
 	}