ci: bring back testing on alpine

Ref: #31

Signed-off-by: Robert Günzler <r@gnzler.io>

Author: robertgzr

.circleci/config.yml

@@ -212,11 +212,6 @@ jobs:
 
 ## WORKFLOWS ##
 
-matrix: &matrix
-  matrix:
-    parameters:
-      os: [ debian, linux, macos, "win/default" ]
-
 workflows:
   postject:
     jobs:
@@ -225,8 +220,16 @@ workflows:
             parameters:
               os: [ linux, macos, "win/default" ]
       - build:
-          <<: *matrix
+          matrix:
+            parameters:
+              os: [ linux, macos, "win/default" ]
       - test:
-          <<: *matrix
+          matrix:
+            parameters:
+              os: [ macos, "win/default" ]
           requires: [ build-<< matrix.os >> ]
-
+      - test:
+          matrix:
+            parameters:
+              os: [ alpine, debian ]
+          requires: [ build-linux ]