add dependency on datrie

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

@@ -1,13 +1,26 @@
 name: 'Build Nominatim'
 
+inputs:
+    ubuntu:
+        description: 'Version of Ubuntu to install on'
+        required: false
+        default: '20'
+
 runs:
     using: "composite"
 
     steps:
         - name: Install 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 python3-psycopg2 python3-pyosmium python3-dotenv python3-psutil python3-jinja2 python3-icu
+            sudo apt-get install -y -qq libboost-system-dev libboost-filesystem-dev libexpat1-dev zlib1g-dev libbz2-dev libpq-dev libproj-dev libicu-dev
+            if [ "x$UBUNTUVER" == "x18" ]; then
+                pip3 install python-dotenv psycopg2==2.7.7 jinja2==2.8 psutil==5.4.2 pyicu osmium
+            else
+                sudo apt-get install -y -qq python3-icu python3-datrie python3-pyosmium python3-jinja2 python3-psutil python3-psycopg2 python3-dotenv
+            fi
           shell: bash
+          env:
+            UBUNTUVER: ${{ inputs.ubuntu }}
 
         - name: Download dependencies
           run: |

.github/workflows/ci-tests.yml

@@ -134,13 +134,8 @@ jobs:
                   postgresql-version: ${{ matrix.postgresql }}
                   postgis-version: ${{ matrix.postgis }}
             - uses: ./Nominatim/.github/actions/build-nominatim
-
-            - name: Install extra dependencies for Ubuntu 18
-              run: |
-                sudo apt-get install libicu-dev
-                pip3 install python-dotenv psycopg2==2.7.7 jinja2==2.8 psutil==5.4.2 pyicu osmium
-              shell: bash
-              if: matrix.ubuntu == 18
+              with:
+                  ubuntu: ${{ matrix.ubuntu }}
 
             - name: Clean installation
               run: rm -rf Nominatim build