ci: add Gitea Actions workflow to build + push pitch-deck image

Builds and pushes to registry.meghsakha.com/breakpilot/pitch-deck
on every push to main that touches pitch-deck/ files. Tags with
:latest and :SHORT_SHA.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/build-pitch-deck.yml

@@ -0,0 +1,37 @@
+# Build + push pitch-deck Docker image to registry.meghsakha.com
+# on every push to main that touches pitch-deck/ files.
+
+name: Build pitch-deck
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'pitch-deck/**'
+
+jobs:
+  build-and-push:
+    runs-on: docker
+    container:
+      image: docker:27-cli
+    steps:
+      - name: Checkout
+        run: |
+          apk add --no-cache git
+          git clone --depth 1 --branch ${GITHUB_REF_NAME} ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git .
+
+      - name: Build image
+        run: |
+          cd pitch-deck
+          SHORT_SHA=$(git rev-parse --short HEAD)
+          docker build \
+            -t registry.meghsakha.com/breakpilot/pitch-deck:latest \
+            -t registry.meghsakha.com/breakpilot/pitch-deck:${SHORT_SHA} \
+            .
+
+      - name: Push to registry
+        run: |
+          SHORT_SHA=$(git rev-parse --short HEAD)
+          docker push registry.meghsakha.com/breakpilot/pitch-deck:latest
+          docker push registry.meghsakha.com/breakpilot/pitch-deck:${SHORT_SHA}
+          echo "Pushed registry.meghsakha.com/breakpilot/pitch-deck:latest + :${SHORT_SHA}"