Simplify deployment method

Using the File type from the Gitlab CI/CD pipeline options, specify the required
files on the command line directly instead of writing to them from a script. SSH
won’t accept the identity file specified (‘DEPLOY_KEY’) if its file permissions
are more permissive than 600.

.gitlab-ci.yml

@@ -40,11 +40,7 @@ deploy:
   dependencies:
     - package
   before_script:
-    - mkdir ~/.ssh/
-    - echo "$DEPLOY_KEY" > ~/.ssh/id_rsa
-    - chmod 600 ~/.ssh/id_rsa
-    - echo -e "$SSH_CONFIG" > ~/.ssh/config
-    - echo "$KNOWN_HOSTS" > ~/.ssh/known_hosts
+    - chmod 600 "$DEPLOY_KEY"
     - apk update && apk add rsync
   script:
-    - rsync -v -c -r --delete bin/ "elpa@ryuslash.org:"
+    - rsync -e "ssh -o \"UserKnownHostsFile $KNOWN_HOSTS\" -p 4511 -i $DEPLOY_KEY" -v -c -r --delete bin/ "elpa@ryuslash.org:"