chore(deps): track alpine ca-certificates dep (#4774)

Signed-off-by: Rui Chen <rui@chenrui.dev>

Dockerfile

@@ -154,10 +154,13 @@ COPY --from=deps /usr/local/bin/conftest /usr/local/bin/conftest
 COPY --from=deps /usr/bin/git-lfs /usr/bin/git-lfs
 COPY docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
 
+# renovate: datasource=repology depName=alpine_3_20/ca-certificates versioning=loose
+ENV CA_CERTIFICATES_VERSION="20240705-r0"
+
 # Install packages needed to run Atlantis.
 # We place this last as it will bust less docker layer caches when packages update
 RUN apk add --no-cache \
-        ca-certificates~=20240705-r0 \
+        ca-certificates~=${CA_CERTIFICATES_VERSION} \
         curl~=8 \
         git~=2 \
         unzip~=6 \