Add asdf image

.github/workflows/build.yml

@@ -0,0 +1,40 @@
+name: Build Image
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  packages: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        image:
+          - asdf
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dorny/paths-filter@v2
+        id: filter
+        with:
+          filters: |
+            image:
+              - '${{ matrix.image }}.Dockerfile'
+              - '${{ matrix.image }}/**'
+      - run: >-
+          docker build
+          -t ghcr.io/${{ github.repository }}/${{ matrix.image }}:${{ github.run_number }}.${{ github.run_attempt }}
+          -f ${{ matrix.image }}.Dockerfile
+          .
+        if: steps.filter.outputs.image == 'true'
+      - run: echo ${{ secrets.GITHUB_TOKEN }} | docker login -u $ --password-stdin ghcr.io
+        name: Login to registry
+        if: ${{ github.event_name == 'push' && steps.filter.outputs.image == 'true' }}
+      - run: docker push ghcr.io/${{ github.repository }}/${{ matrix.image }}:${{ github.run_number }}.${{ github.run_attempt }}
+        if: ${{ github.event_name == 'push' && steps.filter.outputs.image == 'true' }}

asdf.Dockerfile

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+FROM debian:12.2-slim
+LABEL org.opencontainers.image.source=https://github.com/code0-tech/build-images
+
+RUN apt-get update && apt-get install curl git -y
+RUN git clone https://github.com/asdf-vm/asdf.git ~/.asdf --branch v0.13.1
+RUN echo "source $HOME/.asdf/asdf.sh" >> ~/.bashrc