build: Set dockerfile syntax to 1

This should include the 1.4 and all later versions.
The latest version is 1.12.0 so there is a lot of fixes that we where
missing.

.woodpecker/.oci-image-build.yml

@@ -1,6 +1,4 @@
 matrix:
-  TARGET:
-    - bot
   PLATFORM:
     - linux/amd64
 
@@ -16,8 +14,7 @@ steps:
       password:
         from_secret: docker_token
       dockerfile: Dockerfile
-      target: ${TARGET}
+      repo: rg.fr-par.scw.cloud/hamburghammer/dchat/bot
-      repo: rg.fr-par.scw.cloud/hamburghammer/dchat/${TARGET}
       tags: latest
       pull_image: false
       platforms: ${PLATFORM}
@@ -35,8 +32,7 @@ steps:
       password:
         from_secret: docker_token
       dockerfile: Dockerfile
-      target: ${TARGET}
+      repo: rg.fr-par.scw.cloud/hamburghammer/dchat/bot
-      repo: rg.fr-par.scw.cloud/hamburghammer/dchat/${TARGET}
       tags: latest
       pull_image: false
       platforms: ${PLATFORM}

Dockerfile

@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1.4.0
+# syntax=docker/dockerfile:1
 ARG MAVEN_CLI_OPTS="--batch-mode --no-transfer-progress -Dmaven.test.skip"
 
 # Copy all project files