Fix CI build and deploy job rules

.gitlab-ci.yml

@@ -52,8 +52,7 @@ build:
     - vm
   # For now, we're only publishing builds for the proof-of-concept.
   rules:
-    - if: $CI_COMMIT_BRANCH == "proof-of-concept"
-    - if: $CI_PIPELINE_SOURCE == "push"
+    - if: $CI_COMMIT_BRANCH == "proof-of-concept" && $CI_PIPELINE_SOURCE == "push"
   script:
     - cargo build --release
     - podman build --format docker --manifest buildbtw-server --file Containerfile --manifest registry.archlinux.org/archlinux/buildbtw:poc-server-latest target/release
@@ -64,8 +63,7 @@ deploy:
   stage: deploy
   # For now, we're only deploying the proof-of-concept.
   rules:
-    - if: $CI_COMMIT_BRANCH == "proof-of-concept"
-    - if: $CI_PIPELINE_SOURCE == "push"
+    - if: $CI_COMMIT_BRANCH == "proof-of-concept" && $CI_PIPELINE_SOURCE == "push"
   script:
     - pacman -Syu --needed --noconfirm openssh
     - base64 --decode "$SSH_KNOWN_HOSTS" > ~/.ssh/known_hosts