Merge pull request #4506 from nextcloud/enhancement/update_CI_ubuntu

Run package on ubuntu 18.04

.github/workflows/package.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   release-tarball:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     name: Build release tarball
     steps:
       - name: Checkout

.github/workflows/test.yml

@@ -19,7 +19,7 @@ jobs:
       with:
         php-version: ${{ matrix.php-versions }}
         tools: composer:v1
-        extensions: ctype,curl,dom,gd,iconv,intl,json,mbstring,openssl,posix,sqlite,xml,zip
+        extensions: ctype,curl,dom,gd,iconv,intl,json,mbstring,openssl,posix,sqlite,xml,zip,gmp
         coverage: xdebug
     - name: Checkout Nextcloud
       run: git clone https://github.com/nextcloud/server.git --recursive --depth 1 -b ${{ matrix.nextcloud-versions }} nextcloud
@@ -101,7 +101,7 @@ jobs:
             with:
                 php-version: ${{ matrix.php-versions }}
                 tools: composer:v1
-                extensions: ctype,curl,dom,gd,iconv,intl,json,mbstring,openssl,posix,sqlite,xml,zip
+                extensions: ctype,curl,dom,gd,iconv,intl,json,mbstring,openssl,posix,sqlite,xml,zip,gmp
                 coverage: xdebug
           - name: Checkout Nextcloud
             run: git clone https://github.com/nextcloud/server.git --recursive --depth 1 -b ${{ matrix.nextcloud-versions }} nextcloud