Add Github actions workflow

Add Github actions workflow to build and push the base thanatos
container image to ghcr.io when a git tag is pushed

.github/workflows/image.yml

@@ -0,0 +1,64 @@
+name: Build and push the base container image
+
+on:
+  push:
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+  IMAGE_DESCRIPTION: "Base container image for the Thanatos Mythic C2 agent"
+  IMAGE_SOURCE: https://github.com/${{ github.repository }}
+  IMAGE_LICENSE: BSD-3-Clause
+
+jobs:
+  verify-tag:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v4
+
+      - name: Lowercase the container image name
+        run: echo "IMAGE_NAME=${IMAGE_NAME,,}" >> ${GITHUB_ENV}
+
+      - name: Verify the Dockerfile references the correct image url
+        working-directory: Payload_Type/thanatos
+        run: |
+          grep "^FROM ${REGISTRY}/${IMAGE_NAME}:${GITHUB_REF_NAME}$" Dockerfile || (echo "Dockerfile reference does not match ${REGISTRY}/${IMAGE_NAME}:${GITHUB_REF_NAME}"; exit 1)
+
+
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    needs: verify-tag
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Lowercase the container image name
+        run: echo "IMAGE_NAME=${IMAGE_NAME,,}" >> ${GITHUB_ENV}
+
+      - name: Build and push the container image
+        uses: docker/build-push-action@v5
+        with:
+          context: Payload_Type/thanatos
+          file: Payload_Type/thanatos/.docker/Dockerfile
+          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.ref_name }}
+          push: true
+          labels: |
+            org.opencontainers.image.source=${{ env.IMAGE_SOURCE }}
+            org.opencontainers.image.description=${{ env.IMAGE_DESCRIPTION }}
+            org.opencontainers.image.licenses=${{ env.IMAGE_LICENSE }}

Payload_Type/thanatos/Dockerfile

@@ -1,2 +1,2 @@
 # Pull in the thanatos docker image
-FROM docker.io/mehrn00/thanatos:v0.1.3
+FROM ghcr.io/mythicagents/thanatos:v0.1.4