bump builder image for the Knots versions where it can be done

Author: 1ma

.github/workflows/build.yml

@@ -13,11 +13,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        knots-version:
-          - 27.1.knots20240621
-          - 26.1.knots20240513
-          - 26.1.knots20240325
-          - 25.1.knots20231115
+        versions:
+          - { knots: "27.1.knots20240621", alpine-builder: "3.20", platforms: "linux/amd64,linux/arm64,linux/arm/v7,linux/ppc64le,linux/riscv64" }
+          - { knots: "26.1.knots20240513", alpine-builder: "3.20", platforms: "linux/amd64,linux/arm64,linux/arm/v7,linux/ppc64le,linux/riscv64" }
+          - { knots: "26.1.knots20240325", alpine-builder: "3.18", platforms: "linux/amd64,linux/arm64,linux/arm/v7,linux/ppc64le" }
+          - { knots: "25.1.knots20231115", alpine-builder: "3.18", platforms: "linux/amd64,linux/arm64,linux/arm/v7,linux/ppc64le" }
     steps:
       - uses: actions/checkout@v4
       - uses: docker/setup-qemu-action@v3
@@ -29,10 +29,11 @@ jobs:
       - uses: docker/build-push-action@v5
         with:
           build-args: |
-            KNOTS_VERSION=${{ matrix.knots-version }}
+            KNOTS_VERSION=${{ matrix.versions.knots }}
+            ALPINE_BUILDER_VERSION=${{ matrix.versions.alpine-builder }}
           cache-from: type=registry,ref=1maa/bitcoin:v${{ matrix.knots-version }}
           cache-to: type=inline
           context: .
-          platforms: linux/amd64,linux/arm64,linux/arm/v7,linux/ppc64le
+          platforms: ${{ matrix.versions.platforms }}
           push: true
           tags: 1maa/bitcoin:v${{ matrix.knots-version }}

Dockerfile

@@ -1,3 +1,5 @@
+ARG ALPINE_BUILDER_VERSION
+
 FROM alpine:3.20 AS verifier
 
 ARG KNOTS_VERSION
@@ -20,7 +22,7 @@ RUN apk add --no-cache \
  && sha256sum --ignore-missing -c SHA256SUMS
 
 
-FROM alpine:3.18 AS builder
+FROM alpine:${ALPINE_BUILDER_VERSION} AS builder
 
 ARG KNOTS_VERSION