drone: fix INFECT_SOURCE_BRANCH variable

.drone.yml

@@ -13,10 +13,10 @@ steps:
       from_secret: CLOUDFLARE_TOKEN
     USER_PASS:
       from_secret: USER_PASS
-    INFECT_SOURCE_BRANCH: $DRONE_SOURCE_BRANCH
+    INFECT_SOURCE_BRANCH: ${DRONE_SOURCE_BRANCH}
 
   commands:
-  # Create infect user script and then export it to a remote machine on server creation.
+  # Create infect user script and then push it to a remote machine on server creation.
   - echo '#! /usr/bin/env bash' > infect.sh
   - echo "curl https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-infect/raw/branch/$INFECT_SOURCE_BRANCH/nixos-infect | PROVIDER=hetzner DOMAIN=$DOMAIN LUSER=cicdcicd ENCODED_PASSWORD=\"$(printf $USER_PASS | base64)\" CF_TOKEN=$CLOUDFLARE_TOKEN DB_PASSWORD=$USER_PASS API_TOKEN=$USER_PASS HOSTNAME=selfprivacy-ci-test DNS_PROVIDER_TYPE=CLOUDFLARE STAGING_ACME=false NIX_VERSION=2.18.1 NIXOS_CONFIG_NAME=sp-nixos CONFIG_URL=https://git.selfprivacy.org/api/v1/repos/alexoundos/selfprivacy-nixos-top-level/archive/master.tar.gz bash 2>&1 | tee /root/infect.log" >> infect.sh
   - http -v --check-status --ignore-stdin POST https://api.hetzner.cloud/v1/servers Authorization:"Bearer $PASSWORD" name=ci-sibling server_type=cx11 start_after_create:=true image=ubuntu-20.04 user_data=@infect.sh automount:=false location=fsn1
@@ -73,7 +73,7 @@ steps:
 
 - name: sleep
   commands:
-    - sleep 999
+    - sleep 300
 
 - name: test
   environment: