fix: dockerfile

Dockerfile

@@ -1,10 +1,26 @@
-FROM devthefuture/init-container-toolbox:latest@sha256:9511484e313d051713935aa32e91801781b9074ab78ea60f116f9e0dc61a3541
+ARG ALPINE_VERSION=3
+FROM alpine:$ALPINE_VERSION
+
+RUN addgroup -g 1000 user \
+  && adduser \
+  --disabled-password \
+  --gecos "" \
+  --ingroup "user" \
+  --uid 1000 \
+  "user"
+
+RUN apk add --update --no-cache \
+  ca-certificates \
+  curl \
+  bash \
+  tar \
+  jq \
+  openssh-client
 
-USER 0
 ARG HELM_VERSION=3.10.0
 RUN curl -sSL https://get.helm.sh/helm-v${HELM_VERSION}-linux-amd64.tar.gz | tar xz \
   && cp linux-amd64/helm /usr/local/bin/helm
-USER 1000
 
+USER 1000
 COPY entrypoint.sh /
 ENTRYPOINT ["/entrypoint.sh"]