chore: update gitlab CI tags

.gitlab-ci.yml

@@ -3,17 +3,18 @@ stages:
   - test
   - publish
 
-build:
+default:
   tags:
     - linux
+    - docker
+
+build:
   stage: build
   image: rust:latest
   script:
     - cargo build
 
 rustdoc:
-  tags:
-    - linux
   stage: build
   image: rust:latest
   script:
@@ -23,16 +24,12 @@ rustdoc:
       - target/doc
 
 unit-test:
-  tags:
-    - linux
   stage: test  
   image: rust:latest
   script:
     - cargo test --lib
 
 lint-test:  
-  tags:
-    - linux
   stage: test
   image: rust:latest
   script:
@@ -40,8 +37,6 @@ lint-test:
     - cargo clippy
 
 docs:
-  tags:
-    - linux
   stage: publish
   image: alpine
   dependencies:
@@ -53,4 +48,4 @@ docs:
     paths:
       - public
   only:
-    - master
+    - master
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