Improve readme

.gitea/workflows/build.yaml

@@ -29,13 +29,10 @@ jobs:
           username: ${{ secrets.CONTAINER_REGISTRY_GITEA_USERNAME }}
           password: ${{ secrets.CONTAINER_REGISTRY_GITEA_PASSWORD }}
 
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+      - name: Build container image
+        run: |
+          docker build . -t ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
 
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          push: true
-          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
-          provenance: false
+      - name: Push container image
+        run: |
+          docker push ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest

Readme.md

@@ -11,10 +11,11 @@ Running standard Nix commands inside unprivileged Docker containers (which Gitea
 This project solves all of the above by baking everything into a single, clean base image.
 
 ## ✨ Features
-* **Base:** Official `cachix/devenv:latest` (Nix and Devenv pre-installed, flakes enabled).
+* **Base:** Official `docker.gitea.com/runner-images:ubuntu-latest-slim` 
 * **Actions Compatible:** Pre-loaded with `nodejs`, `bash`, and `jq` so standard GitHub/Gitea Actions execute flawlessly.
 * **Privilege Escalation:** Configured with passwordless `sudo` for smooth CI execution.
 * **Pre-cleaned:** The `/homeless-shelter` artifact is purged during the build, guaranteeing a pure Nix environment out-of-the-box.
+* **devenv available:** [devenv](https://devenv.sh/) is already installed and ready to use
 
 ## 🚀 Usage in your CI/CD
 
@@ -33,22 +34,16 @@ jobs:
     # 1. Point the runner to use this custom image
     container:
       image: gitlab.julian-mutter.de/julian/nix-ci-runner:latest
-      # Provide credentials if your registry is private
-      credentials:
-        username: ${{ github.actor }}
-        password: ${{ secrets.GITHUB_TOKEN }}
         
     steps:
       # Node.js is pre-installed, so standard actions work instantly
       - name: Checkout repository
         uses: actions/checkout@v4
       
-      # Optional: Add caching (nix-community/cache-nix-action) here
-      
       # 2. Run your Nix commands natively
       - name: Build Flake
         run: nix build .#default
 ```
 
 ## 🔄 Maintenance
-This repository contains a scheduled Gitea Action that runs **every Sunday**. It automatically pulls the latest `devenv` base image, reinstalls the dependencies, and pushes a fresh `latest` tag to the registry. Your pipelines will always have up-to-date Nix packages without manual intervention.
+This repository contains a scheduled Gitea Action that runs **every Sunday**. It automatically pulls the latest base image, reinstalls the dependencies, and pushes a fresh `latest` tag to the registry. Your pipelines will always have up-to-date Nix packages without manual intervention.