Go: support linux-arm64 in autobuild scripts

The go autobuilder, extractor and identify-environment tools are
arch-native and their per-platform binaries are already built for
linux-arm64, but the unix wrapper scripts hard-gated on linux64/osx64
and bailed with "Automatic build detection ... is not implemented" on
arm64. Allow linux-arm64 so Go extraction works on native Linux Arm64.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: redsun82

go/codeql-tools/autobuild.sh

@@ -2,7 +2,7 @@
 
 set -eu
 
-if [ "$CODEQL_PLATFORM" != "linux64" ] && [ "$CODEQL_PLATFORM" != "osx64" ] ; then
+if [ "$CODEQL_PLATFORM" != "linux64" ] && [ "$CODEQL_PLATFORM" != "linux-arm64" ] && [ "$CODEQL_PLATFORM" != "osx64" ] ; then
     echo "Automatic build detection for $CODEQL_PLATFORM is not implemented."
     exit 1
 fi

go/codeql-tools/identify-environment.sh

@@ -2,7 +2,7 @@
 
 set -eu
 
-if [ "$CODEQL_PLATFORM" != "linux64" ] && [ "$CODEQL_PLATFORM" != "osx64" ] ; then
+if [ "$CODEQL_PLATFORM" != "linux64" ] && [ "$CODEQL_PLATFORM" != "linux-arm64" ] && [ "$CODEQL_PLATFORM" != "osx64" ] ; then
     echo "Automatic build detection for $CODEQL_PLATFORM is not implemented."
     exit 1
 fi

go/codeql-tools/index.sh

@@ -2,7 +2,7 @@
 
 set -eu
 
-if [ "$CODEQL_PLATFORM" != "linux64" ] && [ "$CODEQL_PLATFORM" != "osx64" ] ; then
+if [ "$CODEQL_PLATFORM" != "linux64" ] && [ "$CODEQL_PLATFORM" != "linux-arm64" ] && [ "$CODEQL_PLATFORM" != "osx64" ] ; then
     echo "Automatic build detection for $CODEQL_PLATFORM is not implemented."
     exit 1
 fi