Add .dockerignore file for use during image builds

This was intended to be included along with the recent rootless
container builds work.

refs GH-419

.dockerignore

@@ -0,0 +1,48 @@
+# Copyright 2023 Adam Chalkley
+#
+# https://github.com/atc0005/check-mail
+#
+# Licensed under the MIT License. See LICENSE file in the project root for
+# full license information.
+
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Ignore Visual Studio Code workspace-level settings
+/.vscode
+
+# Ignore go generate produced Windows executable resource files
+*.syso
+
+# Ignore local "scratch" directory of temporary files
+scratch/
+
+# Ignore binaries at root of repo (often generated here when testing)
+/check_imap_mailbox
+/check_imap_mailbox_basic
+/check_imap_mailbox_oauth2
+/list-emails
+/lsimap
+/xoauth2
+
+# Help prevent accidentally including this credentials file in the repo
+accounts.ini
+token.txt
+token.json
+
+# Ignore log and report files generated by the list-emails application
+output/
+log/
+
+# Generated assets are placed here
+/release_assets