Fix Debian container tag from debian:13 to debian:trixie

- Change container image from debian:13 to debian:trixie (correct tag)
- Update environment variable to show '13 (Trixie)' for clarity
- Add explanatory comments about Debian tag naming convention
- Fixes 'manifest unknown' Docker pull errors in both workflows

.forgejo/workflows/build-artifacts.yml

@@ -23,7 +23,7 @@ on:
   workflow_dispatch:
 
 env:
-  DEBIAN_VERSION: "13"
+  DEBIAN_VERSION: "13 (Trixie)"
   RUST_VERSION: "1.84.1"
 
 jobs:
@@ -32,7 +32,8 @@ jobs:
     runs-on: ubuntu-latest
     container:
       # Use Debian 13 (Trixie) since this is a Debian-focused project
-      image: debian:13
+      # Note: debian:trixie is the correct tag for Debian 13
+      image: debian:trixie
     steps:
       - name: Setup build environment
         shell: bash

.forgejo/workflows/simple-build.yml

@@ -15,7 +15,8 @@ jobs:
     runs-on: ubuntu-latest
     container:
       # Use Debian 13 (Trixie) since this is a Debian-focused project
-      image: debian:13
+      # Note: debian:trixie is the correct tag for Debian 13
+      image: debian:trixie
     steps:
       - name: Checkout code and setup environment
         run: |