feat(ci): use ko for image builds

.forgejo/workflows/go.yaml

@@ -24,6 +24,19 @@ jobs:
         with:
           # Semantic version range syntax or exact version of Go
           go-version: '1.21.x'
+      
+      - name: Install ko
+        run: |
+          set -e
+          arch=$(uname -m)
+          case $arch in
+            aarch64)
+              arch="arm64"
+              ;;
+          esac
+          curl -L $(curl -L -s https://api.github.com/repos/ko-build/ko/releases/latest | jq -r "[.assets[] | select(.name | endswith(\"Linux_${arch}.tar.gz\"))][0].browser_download_url") | tar -C /tmp -xzf -
+          mv /tmp/ko /usr/local/bin
+          ko version
 
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v3

.goreleaser.yaml

@@ -40,15 +40,21 @@ archives:
       - nurse
     format: tar.gz
 
-dockers:
-  - ids:
-      - nurse
-    image_templates:
-      - code.icb4dc0.de/prskr/nurse:latest
-      - code.icb4dc0.de/prskr/nurse:{{ .Tag }}
-      - code.icb4dc0.de/prskr/nurse:{{ .Major }}
-      - code.icb4dc0.de/prskr/nurse:{{ .ShortCommit}}
-    dockerfile: deployments/Dockerfile
+kos:
+  - id: nurse
+    build: nurse
+    repository: code.icb4dc0.de/prskr
+    platforms:
+      - linux/amd64
+      - linux/arm64
+    tags:
+      - "latest"
+      - "{{ .Tag }}"
+      - "{{ .Major }}"
+      - "{{ .ShortCommit}}"
+    bare: true
+    preserve_import_paths: false
+    base_import_paths: true
 
 gitea_urls:
   api: https://code.icb4dc0.de/api/v1