fix: alpine miss apnproto

set max-parallel 6

Author: geekwho-eth

.github/workflows/bitcoin_core.yaml

@@ -15,6 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     # use strategy matrix build images
     strategy:
+      max-parallel: 6 # Restrict to serial execution.
       matrix:
         image:
           - name: 25-alpine

30/alpine/Dockerfile

@@ -17,6 +17,7 @@ RUN apk --no-cache add libtool
 RUN apk --no-cache add linux-headers
 RUN apk --no-cache add sqlite-dev
 RUN apk --no-cache add zeromq-dev
+RUN apk add --no-cache capnproto capnproto-dev
 
 ENV BITCOIN_VERSION=30.0
 ENV BITCOIN_PREFIX=/opt/bitcoin-${BITCOIN_VERSION}