feat(semantic-release): provide helper scripts for semantic-release

`prepare` builds the xar file depending on the branch; `publish` uploads to the exist repo

prepare

+#!/bin/bash
+
+usage () {
+    cat << EOF
+    Usage: $(basename $0) branch_name version
+    This script is ment to be invoked in a CI environment only.
+
+EOF
+    exit 2
+}
+
+# TODO: check for `CI_COMMIT_SHORT_SHA` and `EXIST_UPLOAD_PW`; if not set, show warning that not in CI
+
+[[ $# -ne 2 ]] && { usage; }
+
+export BRANCH=$1
+export SR_PV=$2
+
+echo "Building $BRANCH environment $SR_PV..."
+./build
+exit $?

publish

+#!/bin/bash
+
+usage () {
+    cat << EOF
+    Usage: $(basename $0) file
+    This script is ment to be invoked in a CI environment only.
+
+EOF
+    exit 2
+}
+
+# TODO: check for `CI_COMMIT_SHORT_SHA` and/or `EXIST_UPLOAD_PW`; if not set, show warning that not in CI
+
+[[ $# -ne 1 ]] && { usage; }
+
+export FILE=$1
+
+echo "Uploading $FILE ..."
+curl -u ci:${EXIST_UPLOAD_PW} -X POST -F file=@${FILE} https://ci.de.dariah.eu/exist-upload
+exit $?
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