upgrade to golang1.15.5

Dockerfile

@@ -1,7 +1,12 @@
-# Build Geth in a stock Go builder container
-FROM golang:1.14-alpine as builder
+FROM golang:1.15-alpine as builder
 
-RUN apk add --no-cache make gcc musl-dev linux-headers git
+RUN apk add --no-cache make gcc musl-dev linux-headers git bash
+
+# Temporarily pull a custom Go bundle
+ADD https://golang.org/dl/go1.15.5.src.tar.gz /tmp/go.tar.gz
+RUN (cd /tmp && tar -xf go.tar.gz)
+RUN (cd /tmp/go/src && ./make.bash)
+ENV PATH="/tmp/go/bin:${PATH}"
 
 ADD . /go-ethereum
 RUN cd /go-ethereum && make geth
@@ -12,5 +17,5 @@ FROM alpine:latest
 RUN apk add --no-cache ca-certificates
 COPY --from=builder /go-ethereum/build/bin/geth /usr/local/bin/
 
-EXPOSE 8545 8546 8547 30303 30303/udp
-ENTRYPOINT ["geth"]
+EXPOSE 8545 8546 30303 30303/udp
+ENTRYPOINT ["geth"]

go.mod

@@ -1,6 +1,6 @@
 module github.com/ethereum/go-ethereum
 
-go 1.13
+go 1.15
 
 require (
 	github.com/Azure/azure-pipeline-go v0.2.2 // indirect

params/version.go

@@ -23,7 +23,7 @@ import (
 const (
 	VersionMajor = 1  // Major version component of the current release
 	VersionMinor = 0  // Minor version component of the current release
-	VersionPatch = 3  // Patch version component of the current release
+	VersionPatch = 4  // Patch version component of the current release
 	VersionMeta  = "" // Version metadata to append to the version string
 )