ci: fix failed to build arm64 for dev container

Signed-off-by: Alessandro Yuichi Okimoto <yuichijpn@gmail.com>

Author: cre8ivejp

.github/.devcontainer/Dockerfile

@@ -116,21 +116,22 @@ RUN ARCH=$(dpkg --print-architecture) \
     && npm install -g yarn
 
 # Install kubectl, helm, and minikube
+# Using fixed versions to avoid network issues fetching "stable.txt" during build
 RUN ARCH=$(dpkg --print-architecture) \
     && case $ARCH in \
         amd64) K8S_ARCH="amd64" ;; \
         arm64) K8S_ARCH="arm64" ;; \
         *) echo "Unsupported architecture: $ARCH" && exit 1 ;; \
     esac \
-    # Install kubectl
-    && curl -fsSL "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/${K8S_ARCH}/kubectl" -o /usr/local/bin/kubectl \
+    # Install kubectl (using fixed version for reliable builds)
+    && curl -fsSL --retry 3 --retry-delay 5 "https://dl.k8s.io/release/v1.35.0/bin/linux/${K8S_ARCH}/kubectl" -o /usr/local/bin/kubectl \
     && chmod +x /usr/local/bin/kubectl \
     # Install helm
-    && curl -fsSL "https://get.helm.sh/helm-v3.16.4-linux-${K8S_ARCH}.tar.gz" | tar -C /tmp -xzf - \
+    && curl -fsSL --retry 3 --retry-delay 5 "https://get.helm.sh/helm-v3.16.4-linux-${K8S_ARCH}.tar.gz" | tar -C /tmp -xzf - \
     && mv "/tmp/linux-${K8S_ARCH}/helm" /usr/local/bin/helm \
     && rm -rf "/tmp/linux-${K8S_ARCH}" \
-    # Install minikube
-    && curl -fsSL "https://storage.googleapis.com/minikube/releases/latest/minikube-linux-${K8S_ARCH}" -o /usr/local/bin/minikube \
+    # Install minikube (using fixed version for reliable builds)
+    && curl -fsSL --retry 3 --retry-delay 5 "https://storage.googleapis.com/minikube/releases/v1.37.0/minikube-linux-${K8S_ARCH}" -o /usr/local/bin/minikube \
     && chmod +x /usr/local/bin/minikube
 
 # Set up Go environment