ci: add tags

.gitlab-ci.yml

@@ -4,12 +4,16 @@ stages:
   - publish
 
 build:
+  tags:
+    - linux
   stage: build
   image: rust:latest
   script:
     - cargo build
 
 rustdoc:
+  tags:
+    - linux
   stage: build
   image: rust:latest
   script:
@@ -19,18 +23,24 @@ 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:
     - cargo clippy
 
 docs:
+  tags:
+    - linux
   stage: publish
   image: alpine
   dependencies: