ci: add IBM-hosted ppc64le and s390x runners

They're only available in mesonbuild/wrapdb, not in forks.  As a result
the emulated ppc64le job is potentially still useful, but it would likely
bitrot since it wouldn't run in the main repo.  Drop that job.

Self-hosted runners don't count toward the concurrent job limit so this
actually improves our parallelism.

Author: bgilbert

.github/workflows/build_all.yml

@@ -69,6 +69,10 @@ jobs:
         include:
           - platform: aarch64
             runner: ubuntu-24.04-arm
+          - platform: ppc64le
+            runner: ubuntu-24.04-ppc64le
+          - platform: s390x
+            runner: ubuntu-24.04-s390x
           - platform: x86_64
             runner: ubuntu-latest
     steps:
@@ -105,6 +109,12 @@ jobs:
           - platform: aarch64
             runner: ubuntu-24.04-arm
             apk-tools-url: 'https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic/v2.14.7/aarch64/apk.static#!sha256!27a975638ddc95a411c9f17c63383e335da9edf6bb7de2281d950c291a11f878'
+          - platform: ppc64le
+            runner: ubuntu-24.04-ppc64le
+            apk-tools-url: 'https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic/v2.14.7/ppc64le/apk.static#!sha256!96ba92b49c8cc97fad06f0dfe3c50ec25c3344890e479999ded8752bf9e80d7f'
+          - platform: s390x
+            runner: ubuntu-24.04-s390x
+            apk-tools-url: 'https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic/v2.14.7/s390x/apk.static#!sha256!368996f2908ec8f10f1de500bc97a9bd1c3b0b46ce0bd44983ac09862cbab6d5'
           - platform: x86_64
             runner: ubuntu-latest
             apk-tools-url: 'https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic/v2.14.7/x86_64/apk.static#!sha256!bdd044e0fd6cc388c5e571e1093efa5f35f7767cc5aa338b0a2576a429009a62'

.github/workflows/sanity_checks.yml

@@ -70,6 +70,12 @@ jobs:
           - platform: aarch64
             runner: ubuntu-24.04-arm
             python: 3.8
+          - platform: ppc64le
+            runner: ubuntu-24.04-ppc64le
+            python: 3.13
+          - platform: s390x
+            runner: ubuntu-24.04-s390x
+            python: 3.13
           - platform: x86_64
             runner: ubuntu-latest
             python: 3.13
@@ -126,11 +132,14 @@ jobs:
             runner: ubuntu-24.04-arm
             apk-tools-url: 'https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic/v2.14.7/aarch64/apk.static#!sha256!27a975638ddc95a411c9f17c63383e335da9edf6bb7de2281d950c291a11f878'
           - platform: ppc64le
-            runner: ubuntu-24.04-arm
-            apk-tools-url: 'https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic/v2.14.7/aarch64/apk.static#!sha256!27a975638ddc95a411c9f17c63383e335da9edf6bb7de2281d950c291a11f878'
+            runner: ubuntu-24.04-ppc64le
+            apk-tools-url: 'https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic/v2.14.7/ppc64le/apk.static#!sha256!96ba92b49c8cc97fad06f0dfe3c50ec25c3344890e479999ded8752bf9e80d7f'
           - platform: riscv64
             runner: ubuntu-24.04-arm
             apk-tools-url: 'https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic/v2.14.7/aarch64/apk.static#!sha256!27a975638ddc95a411c9f17c63383e335da9edf6bb7de2281d950c291a11f878'
+          - platform: s390x
+            runner: ubuntu-24.04-s390x
+            apk-tools-url: 'https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic/v2.14.7/s390x/apk.static#!sha256!368996f2908ec8f10f1de500bc97a9bd1c3b0b46ce0bd44983ac09862cbab6d5'
           - platform: x86
             runner: ubuntu-latest
             apk-tools-url: 'https://gitlab.alpinelinux.org/api/v4/projects/5/packages/generic/v2.14.7/x86_64/apk.static#!sha256!bdd044e0fd6cc388c5e571e1093efa5f35f7767cc5aa338b0a2576a429009a62'