Revert "lock to go 1.20.7" (#860)

This reverts commit 7ea28b0.

This commit was originally added to pin the golang build version to
1.20.7 because of an issue in golang related to CGO: golang/go#62130 (comment)

This issue was fixed for most systems, although the issue is still open
because it appears to have opened up a separate issue with MUSL-based
systems (such as alpine): golang/go#68285

Since the fluent-bit container is on a glibc-based system (Amazon
Linux), we should be safe to revert back to building with the latest
version of golang.

scripts/build_plugins.sh

@@ -166,13 +166,10 @@ fi
 # get Go stable version
 # Dockerfiles do not allow env vars to be set by commands
 # and persist from one command to the next
-# GO_OUTPUT=$(curl --silent https://go.dev/VERSION?m=text | cut -d "o" -f 2)
-# OLD_IFS=$IFS
-# IFS=$'\n' GO_STABLE_VERSION=($GO_OUTPUT)
-# IFS=$OLD_IFS
-# 2023-08-21: pinning to 1.20.7 go as 1.21.0 fails with FLB
-# https://github.com/golang/go/issues/62130#issuecomment-1684431260
-export GO_STABLE_VERSION="1.20.7"
+GO_OUTPUT=$(curl --silent https://go.dev/VERSION?m=text | cut -d "o" -f 2)
+OLD_IFS=$IFS
+IFS=$'\n' GO_STABLE_VERSION=($GO_OUTPUT)
+IFS=$OLD_IFS
 echo "Using go:stable version ${GO_STABLE_VERSION}"
 PLUGIN_BUILD_ARGS="$PLUGIN_BUILD_ARGS --build-arg GO_STABLE_VERSION=${GO_STABLE_VERSION}"
 

scripts/dockerfiles/Dockerfile.build

@@ -38,12 +38,11 @@ RUN yum install -y  \
       --slave /usr/local/bin/ccmake ccmake /usr/bin/ccmake3 \
       --family cmake
 ENV HOME /home
-ENV GO_STABLE_VERSION 1.20.7
 
 # Lock Go Lang version to stable
-# RUN export GO_STABLE_OUTPUT=`curl --silent https://go.dev/VERSION?m=text | cut -d "o" -f 2`; \
-#       IFS=$'\n' GO_STABLE_VERSION=($GO_STABLE_OUTPUT); \
-RUN   echo "Using go:stable version ${GO_STABLE_VERSION}"; \
+RUN export GO_STABLE_OUTPUT=`curl --silent https://go.dev/VERSION?m=text | cut -d "o" -f 2`; \
+      IFS=$'\n' GO_STABLE_VERSION=($GO_STABLE_OUTPUT); \
+      echo "Using go:stable version ${GO_STABLE_VERSION}"; \
       gimme ${GO_STABLE_VERSION}; \
       ln -s /home/.gimme/versions/go${GO_STABLE_VERSION}.linux.arm64 /home/.gimme/versions/gostable.linux.arm64; \
       ln -s /home/.gimme/versions/go${GO_STABLE_VERSION}.linux.amd64 /home/.gimme/versions/gostable.linux.amd64

scripts/dockerfiles/Dockerfile.build-init

@@ -4,12 +4,11 @@ RUN curl -sL -o /bin/gimme https://raw.githubusercontent.com/travis-ci/gimme/mas
 RUN chmod +x /bin/gimme
 RUN yum upgrade -y && yum install -y tar gzip git
 ENV HOME /home
-ENV GO_STABLE_VERSION 1.20.7
 
 # Lock Go Lang version to stable
-# RUN export GO_STABLE_OUTPUT=`curl --silent https://go.dev/VERSION?m=text | cut -d "o" -f 2`; \
-#       IFS=$'\n' GO_STABLE_VERSION=($GO_STABLE_OUTPUT); \
-RUN   echo "Using go:stable version ${GO_STABLE_VERSION}"; \
+RUN export GO_STABLE_OUTPUT=`curl --silent https://go.dev/VERSION?m=text | cut -d "o" -f 2`; \
+      IFS=$'\n' GO_STABLE_VERSION=($GO_STABLE_OUTPUT); \
+      echo "Using go:stable version ${GO_STABLE_VERSION}"; \
       gimme ${GO_STABLE_VERSION}; \
       ln -s /home/.gimme/versions/go${GO_STABLE_VERSION}.linux.arm64 /home/.gimme/versions/gostable.linux.arm64; \
       ln -s /home/.gimme/versions/go${GO_STABLE_VERSION}.linux.amd64 /home/.gimme/versions/gostable.linux.amd64