first commit

.forgejo/workflows/nix.yaml

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+on: [push]
+jobs:
+  build:
+    runs-on: nix
+    steps:
+      - uses: actions/checkout@v3
+      - run: nix build -L .#runner
+      - name: upload image
+        run: |
+          docker login -u ${{ secrets.REG_USER }} -p ${{ secrets.REG_TOKEN }} ${{ secrets.CI_REGISTRY }}
+          export IMAGE_TAG=$(docker load -i result | grep -Po 'Loaded image.*: \K.*')
+          echo "Pushing image ${IMAGE_TAG}"
+          docker tag "${IMAGE_TAG}" "${{ secrets.CI_REGISTRY }}/${{ secrets.REG_USER }}/nix-runner:latest"
+          docker push "${{ secrets.CI_REGISTRY }}/${{ secrets.REG_USER }}/nix-runner:latest"