Debian packages: Add explicit check for locale-gen creating locales

In case Debian changes the logic of how locale-gen works, this will flag it early during the build process.
docker-library · Dec 7, 2023 · a42b684 · a42b684
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commit a42b684
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diff --git a/11/bookworm/Dockerfile b/11/bookworm/Dockerfile
diff --git a/11/bullseye/Dockerfile b/11/bullseye/Dockerfile
diff --git a/12/bookworm/Dockerfile b/12/bookworm/Dockerfile
diff --git a/12/bullseye/Dockerfile b/12/bullseye/Dockerfile
diff --git a/13/bookworm/Dockerfile b/13/bookworm/Dockerfile
diff --git a/13/bullseye/Dockerfile b/13/bullseye/Dockerfile
diff --git a/14/bookworm/Dockerfile b/14/bookworm/Dockerfile
diff --git a/14/bullseye/Dockerfile b/14/bullseye/Dockerfile
diff --git a/15/bookworm/Dockerfile b/15/bookworm/Dockerfile
diff --git a/15/bullseye/Dockerfile b/15/bullseye/Dockerfile
diff --git a/16/bookworm/Dockerfile b/16/bookworm/Dockerfile
diff --git a/16/bullseye/Dockerfile b/16/bullseye/Dockerfile
diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
@@ -49,8 +49,9 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y --no-install-recommends locales; rm -rf /var/lib/apt/lists/*; \
-	echo en_US.UTF-8 UTF-8 >> /etc/locale.gen; \
-	locale-gen
+	echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen; \
+	locale-gen; \
+	locale -a | grep 'en_US.utf8'
 ENV LANG en_US.utf8
 
 RUN set -eux; \