Try to fix CI.

It's been quite a few years, and the CI is no longer working here.
We need to do lots of little fixes to make things build again.

Since then...

* centos' mirrorlist has gone away entirely.
* Prince 15.4.1 is now the latest 15.x version.
* GitHub no longer supports running on Ubuntu 20.04.
* 24.04 is now available for testing, we've dropped 18.04.
* Linux Mint 22 is now available (dropping 18)
* Debian 12 tested (10 no longer supported).

Author: gerph

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ on:
 
 jobs:
   test-examples:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     container: ubuntu:20.04
     steps:
       - uses: actions/checkout@v3
@@ -38,10 +38,10 @@ jobs:
 
   # Tests for different platforms
   test-platforms:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
-        os: ["ubuntu:18.04", "ubuntu:20.04", "ubuntu:22.04", "centos:7", "centos:8", "debian:10", "linuxmintd/mint18-amd64", "linuxmintd/mint20-amd64"]
+        os: ["ubuntu:20.04", "ubuntu:22.04", "ubuntu:24.04", "centos:7", "centos:8", "debian:12", "linuxmintd/mint20-amd64", "linuxmintd/mint22-amd64"]
         #os: ["ubuntu:18.04"]
     container: ${{ matrix.os }}
     needs: test-examples #  always run after the baseline tests
@@ -55,13 +55,20 @@ jobs:
           for i in /etc/yum.repos.d/* ; do sed -i 's/mirrorlist/#mirrorlist/' $i ; done
           for i in /etc/yum.repos.d/* ; do sed -i 's!#baseurl=http://mirror.!baseurl=http://vault.!' $i ; done
 
+      - name: Prerequisites for CentOS 7
+        if: matrix.os == 'centos:7'
+        run: |
+          sed -i 's/mirror\.centos\.org/vault.centos.org/g' /etc/yum.repos.d/CentOS-*.repo
+          sed -i 's/^#.*baseurl=http/baseurl=http/g' /etc/yum.repos.d/CentOS-*.repo
+          sed -i 's/^mirrorlist=http/#mirrorlist=http/g' /etc/yum.repos.d/CentOS-*.repo
+
       - name: Build examples
         run: |
           crosscompile/build-examples.sh
 
   test-riscos:
     # The type of runner that the job will run on
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     needs: test-examples #  always run after the baseline tests
 
     # Steps represent a sequence of tasks that will be executed as part of the job
@@ -93,7 +100,7 @@ jobs:
           # If it didn't report an error, the test was successful.
 
   export-posix:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     needs: ["test-riscos", "test-platforms"]
     steps:
       - uses: actions/checkout@v3
@@ -119,7 +126,7 @@ jobs:
 
   export-riscos:
     # The type of runner that the job will run on
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     needs: ["test-riscos", "test-platforms"]
 
     outputs:

.gitlab-ci.yml

@@ -45,26 +45,26 @@ test-examples:
 
 
 # A collection of tests for different platforms
-p:ubuntu-18.04:
-  image: ubuntu:18.04
+p:ubuntu-20.04:
+  image: ubuntu:20.04
   stage: platforms
   needs: ['test-examples']
   script:
     - crosscompile/build-examples.sh
   tags:
     - linux
 
-p:ubuntu-20.04:
-  image: ubuntu:20.04
+p:ubuntu-22.04:
+  image: ubuntu:22.04
   stage: platforms
   needs: ['test-examples']
   script:
     - crosscompile/build-examples.sh
   tags:
     - linux
 
-p:ubuntu-22.04:
-  image: ubuntu:22.04
+p:ubuntu-24.04:
+  image: ubuntu:24.04
   stage: platforms
   needs: ['test-examples']
   script:
@@ -77,6 +77,9 @@ p:centos-7:
   stage: platforms
   needs: ['test-examples']
   script:
+    - sed -i 's/mirror\.centos\.org/vault.centos.org/g' /etc/yum.repos.d/CentOS-*.repo
+    - sed -i 's/^#.*baseurl=http/baseurl=http/g' /etc/yum.repos.d/CentOS-*.repo
+    - sed -i 's/^mirrorlist=http/#mirrorlist=http/g' /etc/yum.repos.d/CentOS-*.repo
     - crosscompile/build-examples.sh
   tags:
     - linux
@@ -94,20 +97,12 @@ p:centos-8:
   tags:
     - linux
 
-p:debian-10:
-  image: debian:10
-  stage: platforms
-  needs: ['test-examples']
-  script:
-    - crosscompile/build-examples.sh
-  tags:
-    - linux
-
-p:mint-18:
-  image: linuxmintd/mint18-amd64
+p:debian-12:
+  image: debian:12
   stage: platforms
   needs: ['test-examples']
   script:
+    - apt-get update
     - crosscompile/build-examples.sh
   tags:
     - linux
@@ -121,8 +116,8 @@ p:mint-20:
   tags:
     - linux
 
-p:mint-21:
-  image: linuxmintd/mint20-amd64
+p:mint-22:
+  image: linuxmintd/mint22-amd64
   stage: platforms
   needs: ['test-examples']
   script:

crosscompile/build-examples.sh

@@ -29,7 +29,7 @@
 set -e
 set -o pipefail
 
-PRINCE_VERSION=15.1
+PRINCE_VERSION=15.4.1
 SYSTEM="$(uname -s)"
 
 if [[ "$SYSTEM" = 'Darwin' ]] ; then