Add support for Postgres 16 with PostGIS 3.4

16-3.4/Dockerfile

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+# Base image: PostgreSQL 16 on Bullseye (amd64/arm64)
+FROM postgres:16-bullseye
+
+LABEL maintainer="PostGIS Project - https://postgis.net" \
+      org.opencontainers.image.description="PostGIS 3.4.3 spatial extension with PostgreSQL 16, built from source" \
+      org.opencontainers.image.source="https://github.com/postgis/docker-postgis"
+
+ENV POSTGIS_MAJOR=3
+ENV POSTGIS_VERSION=3.4.3
+ENV PG_MAJOR=16
+
+# Install build dependencies for PostGIS
+RUN apt-get update \
+      && apt-get install -y --no-install-recommends \
+      build-essential \
+      ca-certificates \
+      wget \
+      curl \
+      gnupg \
+      software-properties-common \
+      autoconf \
+      automake \
+      libtool \
+      pkg-config \
+      libxml2-dev \
+      libgeos-dev \
+      libproj-dev \
+      libgdal-dev \
+      libjson-c-dev \
+      libprotobuf-c-dev \
+      libsqlite3-dev \
+      libcurl4-openssl-dev \
+      libreadline-dev \
+      liblzma-dev \
+      libpcre2-dev \
+      bison \
+      flex \
+      postgresql-server-dev-$PG_MAJOR \
+      && rm -rf /var/lib/apt/lists/*
+
+# Download and build PostGIS 3.4.3 from source
+WORKDIR /usr/src
+RUN wget -qO postgis.tar.gz "https://download.osgeo.org/postgis/source/postgis-$POSTGIS_VERSION.tar.gz" \
+      && tar xzf postgis.tar.gz \
+      && rm postgis.tar.gz \
+      && cd postgis-$POSTGIS_VERSION \
+      && ./configure --with-pgconfig=/usr/lib/postgresql/$PG_MAJOR/bin/pg_config --without-protobuf \
+      && make \
+      && make install
+
+# Clean up source directory
+RUN rm -rf /usr/src/postgis-$POSTGIS_VERSION
+
+# Init scripts directory
+RUN mkdir -p /docker-entrypoint-initdb.d
+COPY ./initdb-postgis.sh /docker-entrypoint-initdb.d/10_postgis.sh
+COPY ./update-postgis.sh /usr/local/bin
+

16-3.4/initdb-postgis.sh

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+#!/bin/bash
+
+set -e
+
+# Perform all actions as $POSTGRES_USER
+export PGUSER="$POSTGRES_USER"
+
+# Create the 'template_postgis' template db
+"${psql[@]}" <<- 'EOSQL'
+CREATE DATABASE template_postgis IS_TEMPLATE true;
+EOSQL
+
+# Load PostGIS into both template_database and $POSTGRES_DB
+for DB in template_postgis "$POSTGRES_DB"; do
+	echo "Loading PostGIS extensions into $DB"
+	"${psql[@]}" --dbname="$DB" <<-'EOSQL'
+		CREATE EXTENSION IF NOT EXISTS postgis;
+		CREATE EXTENSION IF NOT EXISTS postgis_topology;
+		-- Reconnect to update pg_setting.resetval
+		-- See https://github.com/postgis/docker-postgis/issues/288
+		\c
+		CREATE EXTENSION IF NOT EXISTS fuzzystrmatch;
+		CREATE EXTENSION IF NOT EXISTS postgis_tiger_geocoder;
+EOSQL
+done

16-3.4/update-postgis.sh

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+#!/bin/sh
+
+set -e
+
+# Perform all actions as $POSTGRES_USER
+export PGUSER="$POSTGRES_USER"
+
+POSTGIS_VERSION="${POSTGIS_VERSION%%+*}"
+
+# Load PostGIS into both template_database and $POSTGRES_DB
+for DB in template_postgis "$POSTGRES_DB" "${@}"; do
+    echo "Updating PostGIS extensions '$DB' to $POSTGIS_VERSION"
+    psql --dbname="$DB" -c "
+        -- Upgrade PostGIS (includes raster)
+        CREATE EXTENSION IF NOT EXISTS postgis VERSION '$POSTGIS_VERSION';
+        ALTER EXTENSION postgis UPDATE TO '$POSTGIS_VERSION';
+
+        -- Upgrade Topology
+        CREATE EXTENSION IF NOT EXISTS postgis_topology VERSION '$POSTGIS_VERSION';
+        ALTER EXTENSION postgis_topology UPDATE TO '$POSTGIS_VERSION';
+
+        -- Install Tiger dependencies in case not already installed
+        CREATE EXTENSION IF NOT EXISTS fuzzystrmatch;
+        -- Upgrade US Tiger Geocoder
+        CREATE EXTENSION IF NOT EXISTS postgis_tiger_geocoder VERSION '$POSTGIS_VERSION';
+        ALTER EXTENSION postgis_tiger_geocoder UPDATE TO '$POSTGIS_VERSION';
+    "
+done