pass in not_cran=false and rername

Author: thisisnic

compose.yaml

@@ -1800,7 +1800,6 @@ services:
       ARROW_SOURCE_HOME: "/arrow"
       ARROW_R_DEV: "TRUE"
       ARROW_USE_PKG_CONFIG: "false"
-      NOT_CRAN: "false"
     volumes:
       - .:/arrow:delegated
     command: /arrow/ci/scripts/r_test.sh /arrow

dev/tasks/tasks.yml

@@ -669,11 +669,12 @@ tasks:
     ci: github
     template: r/github.linux.cran.yml
 
-  test-r-alpine-linux:
+  test-r-alpine-linux-cran:
     ci: github
     template: docker-tests/github.linux.yml
     params:
       image: alpine-linux-r
+      flags: -e NOT_CRAN=false
 
   test-r-macos-as-cran:
     ci: github