actions: move tests from Ubuntu 18 to 20

These are the tests that try to make sure old library version really
still work as expected. Increases PHP to 7.3 because 7.2 has errors.

.github/actions/build-nominatim/action.yml

@@ -1,10 +1,10 @@
 name: 'Build Nominatim'
 
 inputs:
-    ubuntu:
+    flavour:
         description: 'Version of Ubuntu to install on'
         required: false
-        default: '20'
+        default: 'ubuntu-20'
     cmake-args:
         description: 'Additional options to hand to cmake'
         required: false
@@ -23,10 +23,10 @@ runs:
             sudo rm -rf /opt/hostedtoolcache/go /opt/hostedtoolcache/CodeQL /usr/lib/jvm /usr/local/share/chromium /usr/local/lib/android
             df -h
           shell: bash
-        - name: Install prerequisites
+        - name: Install${{ matrix.flavour }} prerequisites
           run: |
             sudo apt-get install -y -qq libboost-system-dev libboost-filesystem-dev libexpat1-dev zlib1g-dev libbz2-dev libpq-dev libproj-dev libicu-dev liblua${LUA_VERSION}-dev lua${LUA_VERSION}
-            if [ "x$UBUNTUVER" == "x18" ]; then
+            if [ "$FLAVOUR" == "oldstuff" ]; then
                 pip3 install MarkupSafe==2.0.1 python-dotenv psycopg2==2.7.7 jinja2==2.8 psutil==5.4.2 pyicu==2.9 osmium PyYAML==5.1 sqlalchemy==1.4 datrie asyncpg
             else
                 sudo apt-get install -y -qq python3-icu python3-datrie python3-pyosmium python3-jinja2 python3-psutil python3-psycopg2 python3-dotenv python3-yaml python3-asyncpg
@@ -34,7 +34,7 @@ runs:
             fi
           shell: bash
           env:
-            UBUNTUVER: ${{ inputs.ubuntu }}
+            FLAVOUR: ${{ inputs.flavour }}
             CMAKE_ARGS: ${{ inputs.cmake-args }}
             LUA_VERSION: ${{ inputs.lua }}
 

.github/workflows/ci-tests.yml

@@ -37,20 +37,26 @@ jobs:
         needs: create-archive
         strategy:
             matrix:
-                ubuntu: [18, 20, 22]
+                flavour: [oldstuff, "ubuntu-20", "ubuntu-22"]
                 include:
-                    - ubuntu: 18
-                      postgresql: 9.6
-                      postgis: 2.5
-                      php: 7.2
-                    - ubuntu: 20
+                    - flavour: oldstuff
+                      ubuntu: 20
+                      postgresql: '9.6'
+                      postgis: '2.5'
+                      php: '7.3'
+                      lua: '5.1'
+                    - flavour: ubuntu-20
+                      ubuntu: 20
                       postgresql: 13
                       postgis: 3
-                      php: 7.4
-                    - ubuntu: 22
+                      php: '7.4'
+                      lua: '5.3'
+                    - flavour: ubuntu-22
+                      ubuntu: 22
                       postgresql: 15
                       postgis: 3
-                      php: 8.1
+                      php: '8.1'
+                      lua: '5.3'
 
         runs-on: ubuntu-${{ matrix.ubuntu }}.04
 
@@ -72,7 +78,7 @@ jobs:
             - uses: actions/setup-python@v4
               with:
                 python-version: 3.7
-              if: matrix.ubuntu == 18
+              if: matrix.flavour == 'oldstuff'
 
             - uses: ./Nominatim/.github/actions/setup-postgresql
               with:
@@ -81,23 +87,24 @@ jobs:
 
             - uses: ./Nominatim/.github/actions/build-nominatim
               with:
-                  ubuntu: ${{ matrix.ubuntu }}
+                  flavour: ${{ matrix.flavour }}
+                  lua: ${{ matrix.lua }}
 
             - name: Install test prerequsites (behave from apt)
               run: sudo apt-get install -y -qq python3-behave
-              if: matrix.ubuntu == 20
+              if: matrix.flavour == 'ubuntu-20'
 
             - name: Install test prerequsites (behave from pip)
               run: pip3 install behave==1.2.6
-              if: ${{ (matrix.ubuntu == 18) || (matrix.ubuntu == 22) }}
+              if: (matrix.flavour == 'oldstuff') || (matrix.flavour == 'ubuntu-22')
 
             - name: Install test prerequsites (from apt for Ununtu 2x)
               run: sudo apt-get install -y -qq python3-pytest uvicorn
-              if: matrix.ubuntu >= 20
+              if: matrix.flavour != 'oldstuff'
 
             - name: Install test prerequsites (from pip for Ubuntu 18)
               run: pip3 install pytest uvicorn
-              if: matrix.ubuntu == 18
+              if: matrix.flavour == 'oldstuff'
 
             - name: Install Python webservers
               run: pip3 install falcon sanic sanic-testing starlette
@@ -129,12 +136,12 @@ jobs:
 
             - name: Install newer Python packages (for typechecking info)
               run: pip3 install -U osmium uvicorn
-              if: matrix.ubuntu >= 20
+              if: matrix.flavour != 'oldstuff'
 
             - name: Python static typechecking
               run: python3 -m mypy --strict nominatim
               working-directory: Nominatim
-              if: matrix.ubuntu >= 20
+              if: matrix.flavour != 'oldstuff'
 
     legacy-test:
         needs: create-archive
@@ -151,7 +158,7 @@ jobs:
             - name: Setup PHP
               uses: shivammathur/setup-php@v2
               with:
-                  php-version: 7.4
+                  php-version: '7.4'
 
             - uses: ./Nominatim/.github/actions/setup-postgresql
               with:
@@ -163,7 +170,6 @@ jobs:
 
             - uses: ./Nominatim/.github/actions/build-nominatim
               with:
-                  ubuntu: 20
                   cmake-args: -DBUILD_MODULE=on
 
             - name: Install test prerequsites