Use UTF-8 instead of utf8 as the encoding name

Author: aitap

.github/workflows/R-CMD-check-occasional.yaml

@@ -18,60 +18,60 @@ jobs:
       matrix:
         os: [macOS-latest, windows-latest, ubuntu-latest]
         r: ['devel', 'release', '3.5', '3.6', '4.0', '4.1', '4.2', '4.3', '4.4', '4.5']
-        locale: ['en_US.utf8',
+        locale: ['en_US.UTF-8',
                  # Multibyte characters: Mandarin
-                 'zh_CN.utf8',
+                 'zh_CN.UTF-8',
                  # Encoding: non-UTF-8 locales for French, Mandarin, and Russian
                  'fr_CA.ISO-8859-1', 'zh_CN.GB18030', 'ru_RU.KOI8-R',
                  # Collate order (#3502, see also #7837): Latvian, Azeri, Hungarian, Faroese, Albanian
-                 'lv_LV.utf8', 'az_AZ.utf8', 'hu_HU.utf8', 'fo_FO.utf8', 'sq_MK.utf8',
+                 'lv_LV.UTF-8', 'az_AZ.UTF-8', 'hu_HU.UTF-8', 'fo_FO.UTF-8', 'sq_MK.UTF-8',
                  # Local time formatting (for R bug #19117)
-                 'vi_VN.utf8']
+                 'vi_VN.UTF-8']
         # we're constrained by GHA inflexibility to do a tedious thing here with 'exclude' below.
         #   better would be for GHA to support multiple 'matrix' configs (one for ubuntu, one for other OS);
         #   an approach with multiple jobs would tediously require copy-pasting the _rest_ of the steps
         exclude:
           # only run non-English locale CI on Ubuntu
           - os: macOS-latest
-            locale: 'zh_CN.utf8'
+            locale: 'zh_CN.UTF-8'
           - os: macOS-latest
             locale: 'fr_CA.ISO-8859-1'
           - os: macOS-latest
             locale: 'zh_CN.GB18030'
           - os: macOS-latest
             locale: 'ru_RU.KOI8-R'
           - os: macOS-latest
-            locale: 'lv_LV.utf8'
+            locale: 'lv_LV.UTF-8'
           - os: macOS-latest
-            locale: 'az_AZ.utf8'
+            locale: 'az_AZ.UTF-8'
           - os: macOS-latest
-            locale: 'hu_HU.utf8'
+            locale: 'hu_HU.UTF-8'
           - os: macOS-latest
-            locale: 'fo_FO.utf8'
+            locale: 'fo_FO.UTF-8'
           - os: macOS-latest
-            locale: 'sq_MK.utf8'
+            locale: 'sq_MK.UTF-8'
           - os: macOS-latest
-            locale: 'vi_VN.utf8'
+            locale: 'vi_VN.UTF-8'
           - os: windows-latest
-            locale: 'zh_CN.utf8'
+            locale: 'zh_CN.UTF-8'
           - os: windows-latest
             locale: 'fr_CA.ISO-8859-1'
           - os: windows-latest
             locale: 'zh_CN.GB18030'
           - os: windows-latest
             locale: 'ru_RU.KOI8-R'
           - os: windows-latest
-            locale: 'lv_LV.utf8'
+            locale: 'lv_LV.UTF-8'
           - os: windows-latest
-            locale: 'az_AZ.utf8'
+            locale: 'az_AZ.UTF-8'
           - os: windows-latest
-            locale: 'hu_HU.utf8'
+            locale: 'hu_HU.UTF-8'
           - os: windows-latest
-            locale: 'fo_FO.utf8'
+            locale: 'fo_FO.UTF-8'
           - os: windows-latest
-            locale: 'sq_MK.utf8'
+            locale: 'sq_MK.UTF-8'
           - os: windows-latest
-            locale: 'vi_VN.utf8'
+            locale: 'vi_VN.UTF-8'
           # macOS/arm64 only available for R>=4.1.0
           - os: macOS-latest
             r: '3.5'
@@ -179,7 +179,7 @@ jobs:
             check_args = c(check_args, "--no-build-vignettes", "--ignore-vignettes")
           }
           testing_locale = Sys.getenv("R_CMD_CHECK_LC_ALL") # only set on Linux
-          non_utf8_locale = nzchar(testing_locale) && !grepl("utf8", testing_locale)
+          non_utf8_locale = nzchar(testing_locale) && !grepl("UTF-8", testing_locale)
           if (requireNamespace("rcmdcheck", quietly=TRUE) && !non_utf8_locale) {
             if (nzchar(testing_locale)) Sys.setenv(LC_ALL = testing_locale)
             rcmdcheck::rcmdcheck(args=check_args, build_args=build_args, error_on="warning", check_dir="check")