Build linux executables that link to glibc 2.17 (#1352)

Fixes an unintentional breakage in 0.30.1 that bumped the required glibc to 2.34.

.github/index.pkl

@@ -196,3 +196,27 @@ release {
       }
     } |> toWorkflowJobs
 }
+
+output {
+  files {
+    [[true]] {
+      renderer {
+        converters {
+          ["jobs"] = (it: Mapping<String, Workflow.Job>) ->
+            it
+              .toMap()
+              .mapValues((name, job) ->
+                if (name.contains("linux") && !name.contains("alpine"))
+                  job
+                    .toMap()
+                    .put("container", new Dynamic {
+                      image = "redhat/ubi8:8.10"
+                    })
+                else
+                  job
+              )
+        }
+      }
+    }
+  }
+}