feat: add k3s-inside-dind

builds/k3s-inside-dind/Dockerfile

@@ -0,0 +1,21 @@
+FROM docker:29-dind
+
+ARG TARGETARCH=amd64
+ARG K3S_VERSION=v1.28.2+k3s1
+
+RUN apk add --no-cache bash iptables curl fuse-overlayfs
+
+RUN if [ "$TARGETARCH" = "amd64" ]; then \
+    export SUFFIX=""; \
+    else \
+    export SUFFIX="-$TARGETARCH"; \
+    fi &&  \
+    curl -L -o /usr/local/bin/k3s https://github.com/k3s-io/k3s/releases/download/${K3S_VERSION}/k3s${SUFFIX} && \
+    chmod +x /usr/local/bin/k3s
+
+EXPOSE 6443
+
+COPY entrypoint.sh /usr/local/bin/entrypoint.sh
+RUN chmod +x /usr/local/bin/entrypoint.sh
+
+ENTRYPOINT ["entrypoint.sh"]