fix: update tag pattern in release workflow and set default tag to 'latest'

.github/workflows/nightly.yml

@@ -1,13 +1,9 @@
-name: Development Docker Image (Nightly)
+name: Docker Image (Nightly)
 
 on:
   schedule:
     # Run every night at 5:00 UTC
     - cron: '0 5 * * *'
-  push:
-    branches:
-      - dev
-  workflow_dispatch: # Allow manual triggering
 
 env:
   REGISTRY: docker.io
@@ -89,7 +85,6 @@ jobs:
           tags: |
             type=raw,value=nightly
             type=raw,value=dev-latest
-            type=sha,prefix=dev-
           labels: |
             org.opencontainers.image.created=${{ github.event.head_commit.timestamp }}
             org.opencontainers.image.licenses=MIT

.github/workflows/release.yml

@@ -3,6 +3,7 @@ name: Release Docker Image
 on:
   push:
     tags:
+      - '[0-9][0-9][0-9][0-9].[0-9][0-9].[0-9][0-9]'
 
 env:
   REGISTRY: docker.io
@@ -67,7 +68,7 @@ jobs:
         with:
           context: .
           push: true
-          tags: ${{ steps.meta.outputs.tags }}
+          tags: ${{ steps.meta.outputs.tags || 'latest' }}
           labels: |
             ${{ steps.meta.outputs.labels }}
             org.opencontainers.image.description=$(cat README.md | head -20 | tr '\n' ' ')