build multi-arch pooler image

pooler/Dockerfile

@@ -0,0 +1,52 @@
+FROM container-registry.zalando.net/library/alpine-3.19:latest AS build_stage
+
+WORKDIR /
+RUN apk --update add \
+    autoconf automake build-base c-ares-dev git libevent-dev libtool m4 \
+    openssl-dev py3-docutils py3-pip python3
+
+RUN git clone \
+    --single-branch \
+    --branch=stable-1.23 \
+    --depth 1 \
+    https://github.com/pgbouncer/pgbouncer.git src
+
+WORKDIR /bin
+RUN ln -s ../usr/bin/rst2man.py rst2man
+
+WORKDIR /src
+RUN mkdir /pgbouncer
+RUN git submodule init
+RUN git submodule update
+RUN ./autogen.sh
+RUN	./configure --prefix=/pgbouncer --with-libevent=/usr/lib
+
+RUN sed -i '/dist_man_MANS/d' Makefile
+RUN make
+RUN make install
+
+WORKDIR /src/test
+RUN make check
+
+FROM container-registry.zalando.net/library/alpine-3.19:latest
+RUN apk -U upgrade --no-cache \
+    && apk --no-cache add bash c-ares ca-certificates gettext libevent openssl postgresql-client
+
+RUN \
+    addgroup -g 101 -S pgbouncer && \
+    adduser -u 100 -S pgbouncer && \
+    mkdir -p /etc/pgbouncer /var/log/pgbouncer /var/run/pgbouncer /etc/ssl/certs
+
+COPY --from=build_stage /pgbouncer/bin/pgbouncer /bin/pgbouncer
+COPY pgbouncer.ini.tmpl auth_file.txt.tmpl /etc/pgbouncer/
+COPY entrypoint.sh ./
+
+RUN chown -R pgbouncer:pgbouncer \
+        /var/log/pgbouncer \
+        /var/run/pgbouncer \
+        /etc/pgbouncer \
+        /etc/ssl/certs \
+    && chmod 0755 /entrypoint.sh
+
+USER pgbouncer:pgbouncer
+ENTRYPOINT ["/bin/sh", "/entrypoint.sh"]