Add synapse container build with s3 storage backend

.forgejo/workflows/build-synapse.yaml

@@ -0,0 +1,22 @@
+on:
+  push:
+    paths:
+      - containers/synapse/Containerfile
+  schedule:
+    - cron: '0 12 */7 * *'
+jobs:
+  build-container:
+    runs-on: docker
+    container:
+      image: library/docker:dind
+    steps:
+      - run: apk add --no-cache nodejs git
+      - name: login to container registry
+        run: echo "${{ secrets.DEPLOY_TOKEN }}" | docker login --username ${{ secrets.DEPLOY_USER }} --password-stdin git.janky.solutions
+      - name: build container image
+        uses: docker/build-push-action@v4
+        with:
+          file: Containerfile
+          tags: git.janky.solutions/jankysolutions/infra/synapse:latest
+          platforms: linux/amd64
+          push: true

containers/synapse/Containerfile

@@ -0,0 +1,4 @@
+FROM matrixdotorg/synapse:latest
+RUN pip install boto3
+RUN curl -o /usr/local/lib/python3.11/site-packages/s3_storage_provider.py https://github.com/matrix-org/synapse-s3-storage-provider/raw/v1.4.0/s3_storage_provider.py
+RUN curl -o /usr/local/bin/s3_media_upload https://github.com/matrix-org/synapse-s3-storage-provider/raw/main/scripts/s3_media_upload && chmod +x /usr/local/bin/s3_media_upload