chore: Optimize Docker image layers (#21525)

Signed-off-by: Marco Franssen <[email protected]>

Author: marcofranssen

Diff for: Dockerfile

@@ -6,6 +6,8 @@ ARG BASE_IMAGE=docker.io/library/ubuntu:24.04@sha256:80dd3c3b9c6cecb9f1667e9290b
 ####################################################################################################
 FROM docker.io/library/golang:1.24.1@sha256:c5adecdb7b3f8c5ca3c88648a861882849cc8b02fed68ece31e25de88ad13418 AS builder
 
+WORKDIR /tmp
+
 RUN echo 'deb http://archive.debian.org/debian buster-backports main' >> /etc/apt/sources.list
 
 RUN apt-get update && apt-get install --no-install-recommends -y \
@@ -23,8 +25,6 @@ RUN apt-get update && apt-get install --no-install-recommends -y \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-WORKDIR /tmp
-
 COPY hack/install.sh hack/tool-versions.sh ./
 COPY hack/installers installers
 
@@ -40,8 +40,8 @@ LABEL org.opencontainers.image.source="https://github.com/argoproj/argo-cd"
 
 USER root
 
-ENV ARGOCD_USER_ID=999
-ENV DEBIAN_FRONTEND=noninteractive
+ENV ARGOCD_USER_ID=999 \
+    DEBIAN_FRONTEND=noninteractive
 
 RUN groupadd -g $ARGOCD_USER_ID argocd && \
     useradd -r -u $ARGOCD_USER_ID -g argocd argocd && \
@@ -55,11 +55,13 @@ RUN groupadd -g $ARGOCD_USER_ID argocd && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-COPY hack/gpg-wrapper.sh /usr/local/bin/gpg-wrapper.sh
-COPY hack/git-verify-wrapper.sh /usr/local/bin/git-verify-wrapper.sh
+COPY hack/gpg-wrapper.sh \
+    hack/git-verify-wrapper.sh \
+    entrypoint.sh \
+    /usr/local/bin/
 COPY --from=builder /usr/local/bin/helm /usr/local/bin/helm
 COPY --from=builder /usr/local/bin/kustomize /usr/local/bin/kustomize
-COPY entrypoint.sh /usr/local/bin/entrypoint.sh
+
 # keep uid_entrypoint.sh for backward compatibility
 RUN ln -s /usr/local/bin/entrypoint.sh /usr/local/bin/uid_entrypoint.sh
 
@@ -111,13 +113,13 @@ RUN go mod download
 # Perform the build
 COPY . .
 COPY --from=argocd-ui /src/dist/app /go/src/github.com/argoproj/argo-cd/ui/dist/app
-ARG TARGETOS
-ARG TARGETARCH
+ARG TARGETOS \
+    TARGETARCH
 # These build args are optional; if not specified the defaults will be taken from the Makefile
-ARG GIT_TAG
-ARG BUILD_DATE
-ARG GIT_TREE_STATE
-ARG GIT_COMMIT
+ARG GIT_TAG \
+    BUILD_DATE \
+    GIT_TREE_STATE \
+    GIT_COMMIT
 RUN GIT_COMMIT=$GIT_COMMIT \
     GIT_TREE_STATE=$GIT_TREE_STATE \
     GIT_TAG=$GIT_TAG \
@@ -130,6 +132,7 @@ RUN GIT_COMMIT=$GIT_COMMIT \
 # Final image
 ####################################################################################################
 FROM argocd-base
+ENTRYPOINT ["/usr/bin/tini", "--"]
 COPY --from=argocd-build /go/src/github.com/argoproj/argo-cd/dist/argocd* /usr/local/bin/
 
 USER root
@@ -144,4 +147,3 @@ RUN ln -s /usr/local/bin/argocd /usr/local/bin/argocd-server && \
     ln -s /usr/local/bin/argocd /usr/local/bin/argocd-commit-server
 
 USER $ARGOCD_USER_ID
-ENTRYPOINT ["/usr/bin/tini", "--"]