diff --git a/.gitea/workflows/docker-build-push.yaml b/.gitea/workflows/docker-build-push.yaml
index 627269c..767b84e 100644
--- a/.gitea/workflows/docker-build-push.yaml
+++ b/.gitea/workflows/docker-build-push.yaml
@@ -6,7 +6,6 @@ on:
 
 env:
   REGISTRY: git.frik.su
-  IMAGE_NAME: ${{ gitea.repository }}
 
 jobs:
   build-and-push:
@@ -17,6 +16,11 @@ jobs:
         with:
           fetch-depth: 1
 
+      # Docker image references must be lowercase, while gitea.repository keeps the original case
+      - name: Prepare lowercase image name
+        id: image
+        run: echo "name=$(echo '${{ gitea.repository }}' | tr '[:upper:]' '[:lower:]')" >> "$GITHUB_OUTPUT"
+
       - name: Install Docker
         run: curl -fsSL https://get.docker.com | sh
 
@@ -34,7 +38,7 @@ jobs:
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          images: ${{ env.REGISTRY }}/${{ steps.image.outputs.name }}
           tags: |
             type=ref,event=tag
             type=semver,pattern={{version}}
@@ -49,7 +53,5 @@ jobs:
           platforms: linux/amd64
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          # image-manifest=true + oci-mediatypes=true обязательны для кэша в реестре Gitea,
-          # иначе PUT манифеста кэша падает с 400 Bad Request (go-gitea/gitea#28973)
-          cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache
-          cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:buildcache,mode=max,image-manifest=true,oci-mediatypes=true
+          cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ steps.image.outputs.name }}:buildcache
+          cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ steps.image.outputs.name }}:buildcache,mode=max,image-manifest=true,oci-mediatypes=true