Added initial shell project structure

.gitlab-ci.yml

+image: debian:bullseye-slim
+
+before_script:
+  - apt update -y
+  - apt install -y git make shellcheck golang-go
+  - export GOPATH="$HOME/go"
+  - export PATH="$PATH:$GOPATH/bin"
+  - go get -u github.com/mvdan/sh/cmd/shfmt
+
+linters:
+  script:
+    - make check

Makefile

+SOURCES=./spearhead
+LENGTH=96
+
+check: $(SOURCES)
+	shellcheck -x $^
+	shfmt -i 2 -d $^
+
+format: $(SOURCES)
+	shfmt -i 2 -w $^

spearhead

+#!/bin/bash
+#
+# spearhead
+
+# Copyright (C) 2021:
+#   Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum GFZ
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or (at
+# your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero
+# General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see http://www.gnu.org/licenses/.
+
+#######################################
+# Main function of this script
+# Globals:
+#   None
+# Arguments:
+#   None
+#######################################
+function main() {
+  printf "Hello world\n"
+}
+
+# Call main function of the script
+main