build multi-arch pooler image (#3077)

* build multi-arch pooler image
* add pooler build step in delivery.yaml and bump pooler version
* pull from docker hub not zalando registry
* add pooler step to ghcr workflow
* pass infra roles to auth file via pooler entrypoint
* introduce extra pooler secret for mounting auth_file
* use pbgouncer as image name and push to ghcr on next merge
* build with latest pgbouncer
* integrate new image in e2e process and update pooler image default
* update pooler build dependencies
* build pooler image for e2e test
* more Makefile and e2e run script tweaking

---------

Co-authored-by: Ida Novindasari <idanovinda@gmail.com>

pooler/Dockerfile

@@ -0,0 +1,54 @@
+ARG BASE_IMAGE=alpine:3.22
+FROM ${BASE_IMAGE} AS build_stage
+
+RUN apk add -U --no-cache \
+    autoconf \
+    automake \
+    curl \
+    gcc \
+    libc-dev \
+    libevent \
+    libevent-dev \
+    libtool \
+    make \
+    openssl-dev \
+    pkgconfig \
+    git
+
+WORKDIR /src
+
+RUN git clone --single-branch --depth 1 https://github.com/pgbouncer/pgbouncer.git . && \
+    git checkout $(git describe --tags $(git rev-list --tags --max-count=1))
+
+RUN git submodule init && git submodule update
+
+RUN ./autogen.sh && \
+    ./configure --prefix=/pgbouncer --with-libevent=/usr/lib && \
+    sed -i '/dist_man_MANS/d' Makefile && \
+    make && \
+    make install
+
+FROM ${BASE_IMAGE}
+
+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 -G 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 /etc/pgbouncer/
+COPY entrypoint.sh /entrypoint.sh
+
+RUN chown -R pgbouncer:pgbouncer \
+    /var/log/pgbouncer \
+    /var/run/pgbouncer \
+    /etc/pgbouncer \
+    /etc/ssl/certs \
+    && chmod +x /entrypoint.sh
+
+USER pgbouncer:pgbouncer
+WORKDIR /etc/pgbouncer
+
+ENTRYPOINT ["/bin/sh", "/entrypoint.sh"]