ci: Move gcc-snapshot build for arm64 from Cirrus to GHA

.cirrus.yml

@@ -63,24 +63,6 @@ linux_arm64_container_snippet: &LINUX_ARM64_CONTAINER
   test_script:
     - docker run --rm --mount "type=bind,src=./,dst=/ci_secp256k1" --env-file /tmp/env --replace --name "ci_secp256k1_arm" "ci_secp256k1_arm" bash -c "cd /ci_secp256k1/ && ./ci/ci.sh"
 
-task:
-  name: "ARM64: Linux (Debian stable)"
-  persistent_worker:
-    labels:
-      type: arm64
-  env:
-    ECDH: yes
-    RECOVERY: yes
-    EXTRAKEYS: yes
-    SCHNORRSIG: yes
-    MUSIG: yes
-    ELLSWIFT: yes
-  matrix:
-     # Currently only gcc-snapshot, the other compilers are tested on GHA with QEMU
-     - env: { CC: 'gcc-snapshot' }
-  << : *LINUX_ARM64_CONTAINER
-  << : *CAT_LOGS
-
 task:
   name: "ARM64: Linux (Debian stable), Valgrind"
   persistent_worker:

.github/workflows/ci.yml

@@ -254,6 +254,7 @@ jobs:
         cc:
           - 'gcc'
           - 'clang'
+          - 'gcc-snapshot'
           - 'clang-snapshot'
 
     steps: