feat(test): Add docker images for additional postgres versions

testing/dbtest/docker/Dockerfile.14-alpine

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+FROM postgres:14-alpine
+
+ADD init-db.sh /docker-entrypoint-initdb.d/00-init-db.sh
+ADD restore-benchmark-dumps.sh /docker-entrypoint-initdb.d/01-restore-benchmark-dumps.sh
+ADD postgresql.conf /etc/postgresql/postgresql.conf
+
+CMD ["postgres", "-c", "config_file=/etc/postgresql/postgresql.conf"]

testing/dbtest/docker/Dockerfile.15-alpine

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+FROM postgres:15-alpine
+
+ADD init-db.sh /docker-entrypoint-initdb.d/00-init-db.sh
+ADD restore-benchmark-dumps.sh /docker-entrypoint-initdb.d/01-restore-benchmark-dumps.sh
+ADD postgresql.conf /etc/postgresql/postgresql.conf
+
+CMD ["postgres", "-c", "config_file=/etc/postgresql/postgresql.conf"]

testing/dbtest/docker/Dockerfile.16-alpine

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+FROM postgres:16-alpine
+
+ADD init-db.sh /docker-entrypoint-initdb.d/00-init-db.sh
+ADD restore-benchmark-dumps.sh /docker-entrypoint-initdb.d/01-restore-benchmark-dumps.sh
+ADD postgresql.conf /etc/postgresql/postgresql.conf
+
+CMD ["postgres", "-c", "config_file=/etc/postgresql/postgresql.conf"]