fix(ci): add least-privilege permissions to workflow files

.github/workflows/build_external_container_images.yaml

@@ -5,12 +5,14 @@ on:
 
 permissions:
   contents: read
-  packages: write
 
 jobs:
   build_and_push_images:
     name: Build and Push ${{ matrix.image.name }} Image
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
     strategy:
       matrix:
         image:

.github/workflows/codeql.yml

@@ -11,7 +11,6 @@ on:
 
 permissions:
   contents: read
-  id-token: write # required for SLSA attestation
 
 jobs:
   analyze:

.github/workflows/stale.yml

@@ -5,6 +5,8 @@ on:
     - cron: '30 1 * * *'
   workflow_dispatch:
 
+permissions: {}
+
 jobs:
   close-issues:
     runs-on: ubuntu-latest

pkg/attestation/crafter/collector_aiagentconfig.go

@@ -20,6 +20,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"path/filepath"
 	"sort"
 
 	schemaapi "github.com/chainloop-dev/chainloop/app/controlplane/api/workflowcontract/v1"
@@ -99,20 +100,16 @@ func (c *AIAgentConfigCollector) uploadAgentConfig(
 		return fmt.Errorf("marshaling AI agent config for %s: %w", agentName, err)
 	}
 
-	tmpFile, err := os.CreateTemp("", fmt.Sprintf("ai-agent-config-%s-*.json", agentName))
-	if err != nil {
-		return fmt.Errorf("creating temp file: %w", err)
-	}
-	defer os.Remove(tmpFile.Name())
-
-	if _, err := tmpFile.Write(jsonData); err != nil {
-		tmpFile.Close()
+	// Use a deterministic filename based on the config hash so that retries
+	// produce the same file path and avoid duplicate CAS uploads.
+	tmpPath := filepath.Join(os.TempDir(), fmt.Sprintf("ai-agent-config-%s-%s.json", agentName, data.ConfigHash[:12]))
+	if err := os.WriteFile(tmpPath, jsonData, 0o600); err != nil {
 		return fmt.Errorf("writing temp file: %w", err)
 	}
-	tmpFile.Close()
+	defer os.Remove(tmpPath)
 
 	materialName := fmt.Sprintf("ai-agent-config-%s", agentName)
-	if _, err := cr.AddMaterialContractFree(ctx, attestationID, schemaapi.CraftingSchema_Material_CHAINLOOP_AI_AGENT_CONFIG.String(), materialName, tmpFile.Name(), casBackend, nil); err != nil {
+	if _, err := cr.AddMaterialContractFree(ctx, attestationID, schemaapi.CraftingSchema_Material_CHAINLOOP_AI_AGENT_CONFIG.String(), materialName, tmpPath, casBackend, nil); err != nil {
 		return fmt.Errorf("adding AI agent config material for %s: %w", agentName, err)
 	}