Add "bash3boilerplate" from "https://git.knownelement.com/ExternalVendorCode/bash3boilerplate.git@main"

git-vendor-name: bash3boilerplate
git-vendor-dir: vendor/git.knownelement.com/ExternalVendorCode/bash3boilerplate
git-vendor-repository: https://git.knownelement.com/ExternalVendorCode/bash3boilerplate.git
git-vendor-ref: main

vendor/git.knownelement.com/ExternalVendorCode/bash3boilerplate/test/scenario/templater/app.template.cfg

@@ -0,0 +1,2 @@
+[connection]
+host = ${TARGET_HOST}

vendor/git.knownelement.com/ExternalVendorCode/bash3boilerplate/test/scenario/templater/break.template.cfg

@@ -0,0 +1,3 @@
+[connection]
+host = ${TARGET_HOST}
+port = ${I_DONT_EXIST}

vendor/git.knownelement.com/ExternalVendorCode/bash3boilerplate/test/scenario/templater/run.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+set -o pipefail
+set -o errexit
+set -o nounset
+# set -o xtrace
+
+__dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+__file="${__dir}/$(basename "${BASH_SOURCE[0]}")"
+__base="$(basename "${__file}" .sh)"
+
+__root="$(cd "$(dirname "$(dirname "$(dirname "${__dir}")")")" && pwd)"
+
+__templaterTmpFile=$(mktemp "${TMPDIR:-/tmp}/${__base}.XXXXXX")
+function cleanup_before_exit () { rm "${__templaterTmpFile:?}"; }
+trap cleanup_before_exit EXIT
+
+echo "--"
+env TARGET_HOST="127.0.0.1" bash "${__root}/src/templater.sh" ./app.template.cfg "${__templaterTmpFile}"
+cat "${__templaterTmpFile}"
+
+echo "--"
+export TARGET_HOST="127.0.0.1"
+
+# shellcheck source=src/templater.sh
+source "${__root}/src/templater.sh"
+
+templater ./app.template.cfg "${__templaterTmpFile}"
+cat "${__templaterTmpFile}"
+
+echo "--"
+env ALLOW_REMAINDERS="1" TARGET_HOST="127.0.0.1" bash "${__root}/src/templater.sh" ./break.template.cfg "${__templaterTmpFile}"
+cat "${__templaterTmpFile}"
+
+echo "--"
+env TARGET_HOST="127.0.0.1" bash "${__root}/src/templater.sh" ./break.template.cfg "${__templaterTmpFile}"
+cat "${__templaterTmpFile}"