fix: add --no-cache to docker builds to prevent stale images

Docker layer caching on the runner was reusing old layers even
when source code changed, resulting in images with outdated code.

.forgejo/workflows/dev.yml

@@ -37,7 +37,7 @@ jobs:
           echo "${REGISTRY_TOKEN}" | docker login "${REGISTRY}" \
             -u "${{ github.repository_owner }}" --password-stdin
 
-          docker build \
+          docker build --no-cache \
             --build-arg "VERSION=${VERSION}" \
             -t "${IMAGE}:v${VERSION}" \
             -t "${IMAGE}:dev" \

.forgejo/workflows/release.yml

@@ -214,7 +214,7 @@ jobs:
             -u "${{ github.repository_owner }}" --password-stdin
 
           # Build the image
-          docker build \
+          docker build --no-cache \
             --build-arg "VERSION=${VERSION}" \
             -t "${IMAGE}:${TAG}" \
             -t "${IMAGE}:${MAJOR}.${MINOR}" \