fix: revert to stable Rust versions in CI and Docker

- Revert Rust toolchain from 1.80 to stable in workflow
- Revert Docker base image to rust:alpine for latest stable version
- Version 1.80 may not be available in CI environments

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: haasonsaas

.github/workflows/release.yml

@@ -101,7 +101,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Rust
-        uses: dtolnay/rust-toolchain@1.80
+        uses: dtolnay/rust-toolchain@stable
         with:
           targets: ${{ matrix.target }}
 

Dockerfile

@@ -1,5 +1,5 @@
 # Build stage
-FROM rust:1.80-alpine AS builder
+FROM rust:alpine AS builder
 
 RUN apk add --no-cache musl-dev