fix: Ensure release images are 'clean' (#5344)

Signed-off-by: Simon Behar <simbeh7@gmail.com>

Dockerfile

@@ -88,12 +88,22 @@ RUN JOBS=max yarn --cwd ui build
 
 FROM builder as argoexec-build
 
+# Tell git to forget about all of the files that were not included because of .dockerignore in order to ensure that
+# the git state is "clean" even though said .dockerignore files are not present
+RUN cat .dockerignore >> .gitignore
+RUN git status --porcelain | cut -c4- | xargs git update-index --skip-worktree
+
 RUN --mount=type=cache,target=/root/.cache/go-build make dist/argoexec
 
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 FROM builder as workflow-controller-build
 
+# Tell git to forget about all of the files that were not included because of .dockerignore in order to ensure that
+# the git state is "clean" even though said .dockerignore files are not present
+RUN cat .dockerignore >> .gitignore
+RUN git status --porcelain | cut -c4- | xargs git update-index --skip-worktree
+
 RUN --mount=type=cache,target=/root/.cache/go-build make dist/workflow-controller
 
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@@ -105,6 +115,12 @@ COPY --from=argo-ui ui/dist/app ui/dist/app
 # stop make from trying to re-build this without yarn installed
 RUN touch ui/dist/node_modules.marker
 RUN touch ui/dist/app/index.html
+
+# Tell git to forget about all of the files that were not included because of .dockerignore in order to ensure that
+# the git state is "clean" even though said .dockerignore files are not present
+RUN cat .dockerignore >> .gitignore
+RUN git status --porcelain | cut -c4- | xargs git update-index --skip-worktree
+
 RUN --mount=type=cache,target=/root/.cache/go-build make dist/argo
 
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