gitlab-ci: use any working docker runner

Author: Lawrence Nahum

.gitlab-ci.yml

@@ -6,8 +6,6 @@ linux_release:
     when: on_success
     paths:
     - wally_dist/*
-  tags:
-    - ga
   script:
     - cd $CI_PROJECT_DIR
     - ENABLE_ELEMENTS=--enable-elements ./tools/build_python_wheels.sh
@@ -20,8 +18,6 @@ linux_release:
 
 linux_py2_debug:
   image: greenaddress/wallycore@sha256:ab55c35391af5e762a22db9f532b995b908a12c1bcbce911c528514b0f7295a1
-  tags:
-    - ga
   script:
     - cd $CI_PROJECT_DIR
     - ./tools/cleanup.sh && ./tools/autogen.sh
@@ -30,8 +26,6 @@ linux_py2_debug:
 
 linux_py3_debug:
   image: greenaddress/wallycore@sha256:ab55c35391af5e762a22db9f532b995b908a12c1bcbce911c528514b0f7295a1
-  tags:
-    - ga
   script:
     - cd $CI_PROJECT_DIR
     - ./tools/cleanup.sh && ./tools/autogen.sh
@@ -45,8 +39,6 @@ ubuntu_release:
     when: on_success
     paths:
     - wally_dist/*
-  tags:
-    - ga
   script:
     - cd $CI_PROJECT_DIR
     - ENABLE_ELEMENTS=--enable-elements ./tools/build_python_wheels.sh python3
@@ -131,8 +123,6 @@ apidocs:
     when: on_success
     paths:
     - apidocs.tar.gz
-  tags:
-    - ga
   script:
     - cd $CI_PROJECT_DIR
     - ./tools/cleanup.sh