diff --git a/.github/workflows/master.yml b/.github/workflows/master.yml
index 839c724..906e989 100644
--- a/.github/workflows/master.yml
+++ b/.github/workflows/master.yml
@@ -95,9 +95,8 @@ jobs:
           tags: |
             boky/postfix:latest
             boky/postfix:latest-alpine
-          # linux/386: WARNING: Ignoring https://dl-cdn.alpinelinux.org/alpine/v3.15/main: UNTRUSTED signature
           # linux/s390x: "rsyslog (no such package)"
-          platforms: "linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le"
+          platforms: "linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le"
           cache-from: type=local,src=/tmp/.buildx-cache/alpine
           cache-to: type=local,dest=/tmp/.buildx-cache-new/alpine
           build-args: |
diff --git a/.github/workflows/tags.yml b/.github/workflows/tags.yml
index da1875e..5573c33 100644
--- a/.github/workflows/tags.yml
+++ b/.github/workflows/tags.yml
@@ -95,9 +95,8 @@ jobs:
           tags: |
             boky/postfix:${{ env.RELEASE_VERSION }}
             boky/postfix:${{ env.RELEASE_VERSION }}-alpine
-          # linux/386: WARNING: Ignoring https://dl-cdn.alpinelinux.org/alpine/v3.15/main: UNTRUSTED signature
           # linux/s390x: "rsyslog (no such package)"
-          platforms: "linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le"
+          platforms: "linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64,linux/ppc64le"
           cache-from: type=local,src=/tmp/.buildx-cache/alpine
           cache-to: type=local,dest=/tmp/.buildx-cache-new/alpine
           build-args: |
diff --git a/build.sh b/build.sh
index 6bbda6c..2a93507 100755
--- a/build.sh
+++ b/build.sh
@@ -10,13 +10,14 @@ declare cache_dir
 declare arg_list
 
 if [[ "$CI" == "true" ]]; then
-    cache_form="/tmp/.buildx-cache/alpine"
-    cache_to="/tmp/.buildx-cache-new/alpine"
-else 
-    cache_from="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )/cache"
-    cache_to="${cache_from}"
+    if [[ -f "/tmp/.buildx-cache/alpine/index.json" ]]; then
+        arg_list="$arg_list --cache-from type=local,src=/tmp/.buildx-cache/alpine/index.json"
+    fi
 fi
 
+cache_from="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )/cache"
+cache_to="${cache_from}"
+
 if ! docker buildx inspect multiarch > /dev/null; then
     docker buildx create --name multiarch
 fi