Update Dockerfile, plugin_manifest.yaml files

Dockerfile

+ARG BASE_REGISTRY=registry1.dso.mil/ironbank
+ARG BASE_IMAGE=redhat/ubi/ubi8
+ARG BASE_TAG=8.3
+
+FROM ${BASE_REGISTRY}/${BASE_IMAGE}:${BASE_TAG} AS builder
+
+WORKDIR /app
+
+COPY v1.0.2-rc.tar.gz .
+
+RUN tar xzvf v1.0.2-rc.tar.gz
+
+FROM registry1.dso.mil/ironbank/docker/scratch:ironbank
+
+COPY --from=builder /app/ .
+
+USER 1001
+
+HEALTHCHECK NONE

plugin_manifest.yaml

+---
+apiVersion: v1
+
+# The repository name in repo1, excluding /ironbank-plugins
+plugin-name: "p1-admin-mattermost-plugin"
+
+# The plugin version.
+version: "1.0.2-rc"
+
+# Provide a list of keywords which will be associated
+# with the plugin. This will allow users to search
+# the ironbank website for particular plugins.
+keywords:
+- Mattermost
+- Admin
+- Plugin
+
+# Include the plugin files to download
+resources:
+- url: https://code.il2.dso.mil/platform-one/enterprise-collaboration/mattermost-plugins/admin-plugin/uploads/1c9a014cd159b77ebb78c84742da4a3d/mattermost-admin-plugin-1.0.2-rc.tar.gz
+  filename: v1.0.2-rc.tar.gz
+  validation:
+    type: sha256
+    value: 9f300373f814db6509002a18bf7009096f76166fb9b017f0c011a2371b48b0a4
+
+# Include plugin maintainer info
+maintainers:
+- email: "tyler.dansby@centauricorp.com"
+  name: Pipelines Bo$$ Baby 2
+  username: tylersd
+
+
+#https://github.com/mattermost/mattermost-plugin-jira/releases/download/v3.0.0/jira-3.0.0.tar.gz