Support arch-aware kubectl downloads

Agent-Logs-Url: https://github.com/cloudengine-labs/devops_os/sessions/8929bee2-ec5e-454a-8614-f771484942ab

Co-authored-by: chefgs <7605658+chefgs@users.noreply.github.com>

Author: Copilot

.devcontainer/Dockerfile

@@ -6,6 +6,8 @@ ARG PYTHON_VERSION=3.11
 ARG JAVA_VERSION=17
 ARG NODE_VERSION=20
 ARG GO_VERSION=1.21
+ARG TARGETOS=linux
+ARG TARGETARCH=amd64
 ARG INSTALL_PYTHON=true
 ARG INSTALL_JAVA=true 
 ARG INSTALL_JS=true
@@ -124,9 +126,9 @@ RUN if [ "$INSTALL_TERRAFORM" = "true" ]; then \
 # Install kubectl if requested
 RUN if [ "$INSTALL_KUBECTL" = "true" ]; then \
     KUBECTL_VERSION="$(curl -fsSL https://dl.k8s.io/release/stable.txt)" \
-    && curl -fsSLo /tmp/kubectl "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl" \
-    && curl -fsSLo /tmp/kubectl.sha256 "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl.sha256" \
-    && (test "$(cat /tmp/kubectl.sha256)" = "$(sha256sum /tmp/kubectl | cut -d' ' -f1)" || (echo "kubectl checksum verification failed" && exit 1)) \
+    && curl -fsSLo /tmp/kubectl "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/${TARGETOS}/${TARGETARCH}/kubectl" \
+    && curl -fsSLo /tmp/kubectl.sha256 "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/${TARGETOS}/${TARGETARCH}/kubectl.sha256" \
+    && (test "$(cat /tmp/kubectl.sha256)" = "$(sha256sum /tmp/kubectl | cut -d' ' -f1)" || (echo "kubectl checksum verification failed" >&2 && exit 1)) \
     && install -o root -g root -m 0755 /tmp/kubectl /usr/local/bin/kubectl \
     && rm -f /tmp/kubectl /tmp/kubectl.sha256; \
     fi