chore(dockerfile): Use existing TARGETPLATFORM arg

Author: mdesouky

Dockerfile

@@ -1,36 +1,31 @@
 FROM python:3.12-slim
 
+ARG TARGETPLATFORM
+
 ##
 ## Install kubectl and dependencies.
 ##
 ENV KUBE_LATEST_VERSION="v1.21.3"
 ENV HELM_VERSION="v3.6.2" \
     VIRTUAL_ENV="/app/.venv" \
     PATH="/app/.venv/bin:$PATH"
-ENV TARGETARCH=""
+
 
 RUN apt-get update \
     && apt-get install wget ca-certificates bash git git-crypt -y --no-install-recommends \
-    # Determine target architecture and set TARGETARCH accordingly
-    && case "$(dpkg --print-architecture)" in \
-    amd64) export TARGETARCH="amd64" ;; \
-    arm64) export TARGETARCH="arm64" ;; \
-    *) echo "Unsupported architecture: $(dpkg --print-architecture)"; exit 1 ;; \
-    esac \
-    \
     # Download kubectl
-    && wget -q https://storage.googleapis.com/kubernetes-release/release/${KUBE_LATEST_VERSION}/bin/linux/${TARGETARCH}/kubectl -O /usr/local/bin/kubectl \
+    && wget -q https://storage.googleapis.com/kubernetes-release/release/${KUBE_LATEST_VERSION}/bin/linux/${TARGETPLATFORM}/kubectl -O /usr/local/bin/kubectl \
     && chmod +x /usr/local/bin/kubectl \
     \
     # Download helm
-    && wget -q https://get.helm.sh/helm-${HELM_VERSION}-linux-${TARGETARCH}.tar.gz -O - | tar -xzO linux-${TARGETARCH}/helm > /usr/local/bin/helm \
+    && wget -q https://get.helm.sh/helm-${HELM_VERSION}-linux-${TARGETPLATFORM}.tar.gz -O - | tar -xzO linux-${TARGETPLATFORM}/helm > /usr/local/bin/helm \
     && chmod +x /usr/local/bin/helm \
     \
     # Install helm-secrets plugin
     && helm plugin install https://github.com/jkroepke/helm-secrets --version v4.2.2 \
     \
     # Download sops
-    && wget -q https://github.com/mozilla/sops/releases/download/v3.7.3/sops-v3.7.3.linux.${TARGETARCH} -O /usr/local/bin/sops \
+    && wget -q https://github.com/mozilla/sops/releases/download/v3.7.3/sops-v3.7.3.linux.${TARGETPLATFORM} -O /usr/local/bin/sops \
     && chmod +x  /usr/local/bin/sops \
     \
     && apt-get clean \