Fixed the caching scheme.

.drone.yml

@@ -4,7 +4,7 @@ name: ubuntu
 
 steps:
   - name: create_tags
-    image: ubuntu:22.04
+    image: ubuntu:latest
     commands:
       - echo "$(date "+%Y-%m-%d"), latest" > .tags
 
@@ -28,9 +28,9 @@ steps:
         - linux/arm64
         - linux/arm/v7
       cache_from:
-        - type=local\\,src=/cache/${DRONE_REPO}/ubuntu-${UBUNTU_VER}
+        - type=local\\,src=/cache/${DRONE_REPO}/ubuntu-22.04
       cache_to:
-        - type=local,dest=/cache/${DRONE_REPO}/ubuntu-${UBUNTU_VER},mode=max
+        - type=local,dest=/cache/${DRONE_REPO}/ubuntu-22.04,mode=max
     depends_on:
       - create_tags
 
@@ -43,6 +43,10 @@ steps:
       repo: ${DRONE_REPO_LINK:8}/ubuntu-20.04
       extra_tags:
         - ${DRONE_REPO_LINK:8}:20.04
+      cache_from:
+        - type=local\\,src=/cache/${DRONE_REPO}/ubuntu-20.04
+      cache_to:
+        - type=local,dest=/cache/${DRONE_REPO}/ubuntu-20.04,mode=max
 
   - name: ubuntu_18
     image: thegeeklab/drone-docker-buildx:23
@@ -53,3 +57,7 @@ steps:
       repo: ${DRONE_REPO_LINK:8}/ubuntu-18.04
       extra_tags:
         - ${DRONE_REPO_LINK:8}:18.04
+      cache_from:
+        - type=local\\,src=/cache/${DRONE_REPO}/ubuntu-18.04
+      cache_to:
+        - type=local,dest=/cache/${DRONE_REPO}/ubuntu-18.04,mode=max