♻️ refactor(docker): improve Dockerfile layer efficiency

- separate package installation into distinct layers for better caching
- update aws-iam-authenticator download URL to a specific version for consistency

Author: kodermax

Dockerfile

@@ -1,12 +1,14 @@
 FROM amazon/aws-cli:latest
 
-# Install required tools in one layer to reduce image size
+# Install system packages and jq first
 RUN yum update -y && \
     yum install -y coreutils && \
     curl -sL -o /usr/bin/jq https://github.com/jqlang/jq/releases/download/jq-1.6/jq-linux64 && \
-    chmod +x /usr/bin/jq && \
-    curl -sL -o /usr/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl && \
-    curl -sL -o /usr/bin/aws-iam-authenticator $(curl -s https://api.github.com/repos/kubernetes-sigs/aws-iam-authenticator/releases/latest | jq -r '.assets[] | select(.name | contains("linux_amd64"))' | jq -r '.browser_download_url') && \
+    chmod +x /usr/bin/jq
+
+# Install kubectl and aws-iam-authenticator
+RUN curl -sL -o /usr/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl && \
+    curl -sL -o /usr/bin/aws-iam-authenticator https://github.com/kubernetes-sigs/aws-iam-authenticator/releases/download/v0.6.12/aws-iam-authenticator_0.6.12_linux_amd64 && \
     chmod +x /usr/bin/aws-iam-authenticator && \
     chmod +x /usr/bin/kubectl