Move "bashbrew-arch-to-goenv.sh" into a scripts subdirectory

.dockerignore

@@ -1,5 +1,5 @@
 **
-!.bashbrew-arch-to-goenv.sh
 !go/go.*
 !go/src/
 !go/vendor/
+!scripts/bashbrew-arch-to-goenv.sh

Dockerfile.release

@@ -20,7 +20,7 @@ ENV BASHBREW_ARCHES \
 		s390x \
 		windows-amd64
 
-COPY .bashbrew-arch-to-goenv.sh /usr/local/bin/
+COPY scripts/bashbrew-arch-to-goenv.sh /usr/local/bin/
 
 # https://github.com/estesp/manifest-tool/releases
 ENV MANIFEST_TOOL_VERSION 1.0.2
@@ -36,7 +36,7 @@ RUN set -euxo pipefail; \
 	\
 	for bashbrewArch in $BASHBREW_ARCHES; do \
 		( \
-			goEnv="$(.bashbrew-arch-to-goenv.sh "$bashbrewArch")"; eval "$goEnv"; \
+			goEnv="$(bashbrew-arch-to-goenv.sh "$bashbrewArch")"; eval "$goEnv"; \
 			srcBin="manifest-tool-$GOOS-$GOARCH"; \
 			if [ "$GOARCH" = 'arm' ]; then [ -n "$GOARM" ]; srcBin="${srcBin}v$GOARM"; fi; \
 			[ "$GOOS" = 'windows' ] && ext='.exe' || ext=; \
@@ -64,7 +64,7 @@ RUN set -euxo pipefail; \
 	\
 	for bashbrewArch in $BASHBREW_ARCHES; do \
 		( \
-			goEnv="$(.bashbrew-arch-to-goenv.sh "$bashbrewArch")"; eval "$goEnv"; \
+			goEnv="$(bashbrew-arch-to-goenv.sh "$bashbrewArch")"; eval "$goEnv"; \
 			[ "$GOOS" = 'windows' ] && ext='.exe' || ext=; \
 			\
 			targetBin="bin/bashbrew-$bashbrewArch$ext"; \