Fix GitLab CI dependencies

Test jobs must depend on the corresponding build jobs so the correct build
artifacts are downloaded. Otherwise, the test job will not even have access to
the built packages and install icinga2 from packages.icinga.com.

.gitlab-ci.yml

@@ -84,7 +84,7 @@ test/debian/bullseye:x86_64:
   variables:
     DOCKER_IMAGE: debian/bullseye
   dependencies:
-    - debian/bullseye
+    - debian/bullseye:x86_64
 
 debian/bullseye:x86:
   <<: *binary
@@ -126,7 +126,7 @@ test/debian/buster:x86_64:
   variables:
     DOCKER_IMAGE: debian/buster
   dependencies:
-    - debian/buster
+    - debian/buster:x86_64
 
 debian/buster:x86:
   <<: *binary
@@ -168,7 +168,7 @@ test/debian/stretch:x86_64:
   variables:
     DOCKER_IMAGE: debian/stretch
   dependencies:
-    - debian/stretch
+    - debian/stretch:x86_64
 
 debian/stretch:x86:
   <<: *binary
@@ -214,7 +214,7 @@ test/ubuntu/impish:x86_64:
   variables:
     DOCKER_IMAGE: ubuntu/impish
   dependencies:
-    - ubuntu/impish
+    - ubuntu/impish:x86_64
 
 upload/ubuntu/impish:
   <<: *upload
@@ -240,7 +240,7 @@ test/ubuntu/hirsute:x86_64:
   variables:
     DOCKER_IMAGE: ubuntu/hirsute
   dependencies:
-    - ubuntu/hirsute
+    - ubuntu/hirsute:x86_64
 
 upload/ubuntu/hirsute:
   <<: *upload
@@ -265,7 +265,7 @@ test/ubuntu/focal:x86_64:
   variables:
     DOCKER_IMAGE: ubuntu/focal
   dependencies:
-    - ubuntu/focal
+    - ubuntu/focal:x86_64
 
 upload/ubuntu/focal:
   <<: *upload
@@ -291,7 +291,7 @@ test/ubuntu/bionic:x86_64:
   variables:
     DOCKER_IMAGE: ubuntu/bionic
   dependencies:
-    - ubuntu/bionic
+    - ubuntu/bionic:x86_64
 
 ubuntu/bionic:x86:
   <<: *binary