CI: switch 7 linux jobs to free runners

.github/workflows/ci.yml

@@ -110,11 +110,7 @@ jobs:
       # less disk space.
       - name: free up disk space
         uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be
-        if: contains(matrix.os, 'ubuntu')
-        with:
-          # Removing packages with APT saves ~5 GiB, but takes several
-          # minutes (and potentially removes important packages).
-          large-packages: false
+        if: matrix.free_disk
 
       # Rust Log Analyzer can't currently detect the PR number of a GitHub
       # Actions build on its own, so a hint in the log message is needed to

src/ci/github-actions/jobs.yml

@@ -6,6 +6,8 @@ runners:
 
   - &job-linux-4c
     os: ubuntu-20.04
+    # Free some disk space to avoid running out of space during the build.
+    free_disk: true
     <<: *base-job
 
   # Large runner used mainly for its bigger disk capacity
@@ -135,7 +137,7 @@ auto:
   - image: dist-aarch64-linux
     env:
       CODEGEN_BACKENDS: llvm,cranelift
-    <<: *job-linux-4c-largedisk
+    <<: *job-linux-4c
 
   - image: dist-android
     <<: *job-linux-4c
@@ -156,28 +158,28 @@ auto:
     <<: *job-linux-4c
 
   - image: dist-loongarch64-linux
-    <<: *job-linux-4c-largedisk
+    <<: *job-linux-4c
 
   - image: dist-loongarch64-musl
-    <<: *job-linux-4c-largedisk
+    <<: *job-linux-4c
 
   - image: dist-ohos
     <<: *job-linux-4c
 
   - image: dist-powerpc-linux
-    <<: *job-linux-4c-largedisk
+    <<: *job-linux-4c
 
   - image: dist-powerpc64-linux
-    <<: *job-linux-4c-largedisk
+    <<: *job-linux-4c
 
   - image: dist-powerpc64le-linux
-    <<: *job-linux-4c-largedisk
+    <<: *job-linux-4c
 
   - image: dist-riscv64-linux
     <<: *job-linux-4c
 
   - image: dist-s390x-linux
-    <<: *job-linux-4c-largedisk
+    <<: *job-linux-4c
 
   - image: dist-various-1
     <<: *job-linux-4c