fix variable decl

.gitlab-ci.yml

@@ -1,5 +1,6 @@
 ---
 include:
+  - remote: 'https://git.scc.kit.edu/KIT-CERT/publish/-/raw/main/gitlab-ci/ssh-config.yml'
   - remote: 'https://git.scc.kit.edu/KIT-CERT/publish/-/raw/main/gitlab-ci/build_image.yml'
   - remote: 'https://git.scc.kit.edu/KIT-CERT/publish/-/raw/main/gitlab-ci/python-pkg.yml'
 
@@ -16,7 +17,10 @@ stages:
   - debian-package
 
 .image-buster:
-  IMAGE_NAME: pkg_build-exim-encrypt-dlfunc/buster
+  variables:
+    IMAGE_NAME: pkg_build-exim-encrypt-dlfunc/buster
+    BUILD_FILE: Dockerfile.buster
+    TARGET_REPOSITORY: "buster"
 
 .image-bullseye:
   IMAGE_NAME: pkg_build-exim-encrypt-dlfunc/bullseye
@@ -26,6 +30,16 @@ stages:
     IMAGE_NAME: pkg_build-exim-encrypt-dlfunc/jammy
     BUILD_FILE: Dockerfile.jammy
 
+build_pkg_image_buster:
+  extends:
+    - .image-buster
+    - build_pkg_image
+
+pkg_buster:
+  extends:
+    - .image-buster
+    - python_pkg
+
 build_pkg_image_jammy:
   extends:
     - .image-jammy

ci_container/Dockerfile.buster

@@ -0,0 +1,40 @@
+FROM debian:latest
+
+LABEL org.opencontainers.image.created=${BUILDTIMESTAMP} \
+      org.opencontainers.image.authors="Heiko Reese <reese@kit.edu>" \
+      org.opencontainers.image.title="exim build container" \
+      org.opencontainers.image.description="A buld environment for exim-encrypt-dlfunc" \
+      org.opencontainers.image.source="https://git.scc.kit.edu/mail/exim-encrypt-dlfunc/" \
+      org.opencontainers.image.licenses="Apache-2.0"
+
+RUN apt-get update; \
+    DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical apt-get install --no-install-recommends -y \
+        build-essential \
+        exim4-daemon-heavy \
+        exim4-dev \
+        gcovr \
+        git \
+        libsodium-dev \
+        openssl \
+        pkg-config \
+        python3-pip \
+        libxml2-utils \
+        debhelper \
+        debsigs \
+        devscripts \
+        dh-make \
+        git-buildpackage \
+        gpgv1 \
+        meson \
+        less \
+        mc \
+        rsync \
+        openssh-client \
+        vim; \
+    DEBIAN_FRONTEND=noninteractive DEBIAN_PRIORITY=critical apt-get clean; \
+    rm -rf /var/lib/apt/lists/*;
+
+RUN pip3 install --upgrade meson ninja; \
+    rm -rf ~/.cache/pip/*;
+
+WORKDIR /mnt/