Add Test for PG16

Note other changes needed to be made for this:

 - Add new postgres16, it's misnamed as moment, cause it doesn't have
   postgis yet
    - Change postgresql_postgis.sh to:

       - Use trusted instead of apt-key which is deprecated
       - Added a condition to postgresql_postgis.sh to skip PostGIS
	 install if no PostGIS version is specified
         Since PostGIS is not yet available in
	 apt.postgresql.org repo for PG16
       - Use pgdg-snapshot instead of main
	 repo except for PG12
	 (it has all stable branches and main)
       - For PG12, jsut continue to use main repo,
         since PostGIS 2.5 is not carried in snapshot

.github/scripts/postgresql_postgis.sh

@@ -2,11 +2,34 @@
 
 set -e
 
-wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
-echo "deb http://apt.postgresql.org/pub/repos/apt/ `lsb_release -cs`-pgdg main $POSTGRESQL_VERSION" |sudo tee /etc/apt/sources.list.d/pgdg.list
+curl https://www.postgresql.org/media/keys/ACCC4CF8.asc | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/apt.postgresql.org.gpg >/dev/null
+
+if ["$POSTGRESQL_VERSION" = "12"];
+then
+  echo "deb http://apt.postgresql.org/pub/repos/apt/ `lsb_release -cs`-pgdg main $POSTGRESQL_VERSION" |sudo tee /etc/apt/sources.list.d/pgdg.list
+else
+  echo "deb http://apt.postgresql.org/pub/repos/apt/ `lsb_release -cs`-pgdg-snapshot main $POSTGRESQL_VERSION" |sudo tee /etc/apt/sources.list.d/pgdg.list
+fi
+
+# RAISE priority of pgdg
+cat << EOF >> ./pgdg.pref
+Package: *
+Pin: release o=apt.postgresql.org
+Pin-Priority: 600
+EOF
+sudo mv ./pgdg.pref /etc/apt/preferences.d/
+sudo apt update
 sudo apt-get update
-sudo apt-get --purge remove postgresql\*
-sudo apt-get install -q postgresql-server-dev-$POSTGRESQL_VERSION postgresql-client-$POSTGRESQL_VERSION postgresql-$POSTGRESQL_VERSION-postgis-$POSTGIS_VERSION libcunit1-dev valgrind g++
+sudo apt-get purge postgresql-*
+sudo apt-get install -q postgresql-$POSTGRESQL_VERSION postgresql-server-dev-$POSTGRESQL_VERSION postgresql-client-$POSTGRESQL_VERSION libcunit1-dev valgrind g++
+
+if [ -z "$POSTGIS_VERSION" ]
+then
+      echo "No PostGIS version specified, skipping install of PostGIS"
+else
+      sudo apt-get install postgresql-$POSTGRESQL_VERSION-postgis-$POSTGIS_VERSION
+fi
+
 sudo pg_dropcluster --stop $POSTGRESQL_VERSION main
 sudo rm -rf /etc/postgresql/$POSTGRESQL_VERSION /var/lib/postgresql/$POSTGRESQL_VERSION
 sudo pg_createcluster -u postgres $POSTGRESQL_VERSION main --start -- --auth-local trust --auth-host trust

.github/workflows/jammy_postgres16_postgis3.yml

@@ -0,0 +1,28 @@
+name: "[ubuntu-22.04] PostgreSQL 16 and PostGIS 3"
+
+on:
+  push:
+    branches:
+      - master
+
+  pull_request:
+
+jobs:
+  build:
+    name: Building and testing
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v2
+      - name: Install PostgreSQL and PostGIS
+        env:
+          POSTGRESQL_VERSION: 16
+          #POSTGIS_VERSION: 3
+        run: .github/scripts/postgresql_postgis.sh
+      - name: Install and check PgPointCloud
+        run: .github/scripts/pgpointcloud.sh
+      - name: Error
+        if: ${{ failure() }}
+        run: cat pgsql/regression.diffs
+      - name: Dump and restore tests
+        run: .github/scripts/test_dump_restore.sh