Try update?

.gitea/workflows/container.yaml

@@ -27,8 +27,10 @@ on:
         type: string
       PIPELINE_WORKER_SSH_KEY:
         required: true
+        type: string
       PIPELINE_WORKER_KNOWN_HOSTS:
         required: true
+        type: string
 
 jobs:
   release-image:
@@ -53,6 +55,7 @@ jobs:
               exit 1
           fi
 
+      - run: apt-get update
       - name: Setting up SSH
         if: ${{ hashFiles('requirements_private.txt') != '' }}
         uses: https://github.com/shimataro/ssh-key-action@v2.5.1
@@ -62,7 +65,7 @@ jobs:
           known_hosts: ${{ secrets.PIPELINE_WORKER_KNOWN_HOSTS }}
           config: |
             Host gitfub
-              HostName ${{ inputs.DOCKER_REG_DOMAIN }}
+              HostName gitfub.space
               User ${{ secrets.DOCKER_USERNAME }}
 
       - name: Checkout