ci(docker): attempt to improve broken/slow docker-main build

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

Author: hairyhenderson

.github/workflows/docker-main.yml

@@ -1,7 +1,7 @@
 name: Docker Main Build
 on:
   push:
-    branches: [ main ]
+    branches: [ main, fix-docker-main-build ]
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -11,13 +11,11 @@ jobs:
   docker-main-build:
     runs-on: ubuntu-latest
     steps:
-    - name: Set up QEMU
-      uses: docker/setup-qemu-action@v4.0.0
     - name: Set up Docker Buildx
       id: buildx
       uses: docker/setup-buildx-action@v4.0.0
       with:
-        version: v0.19.3
+        version: v0.32.1
         driver-opts: |
           image=moby/buildkit:buildx-stable-1
           network=host

Dockerfile

@@ -48,9 +48,6 @@ ARG TARGETVARIANT
 LABEL org.opencontainers.image.revision=$VCS_REF \
 	org.opencontainers.image.source="https://github.com/hairyhenderson/gomplate"
 
-# Upgrade zlib to avoid CVE-2026-22184 until alpine:3.23 base image is updated
-RUN apk upgrade --no-cache zlib
-
 COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
 COPY --from=build /bin/gomplate_${TARGETOS}-${TARGETARCH}${TARGETVARIANT} /bin/gomplate