remove markdown-preview plugin, re-enable Pi builds in CI

markdown-preview.nvim runs yarn install with native Node.js binaries
that crash under QEMU aarch64 emulation. The plugin is also useless
on headless servers (requires a browser). Removing it allows the Pi
build to succeed in CI again.

Re-enabled Pi build and SD image jobs in both ci.yml and deploy.yml.

.forgejo/workflows/ci.yml

@@ -22,6 +22,5 @@ jobs:
       - name: Build cryodev-main
         run: nix build .#nixosConfigurations.cryodev-main.config.system.build.toplevel --impure
 
-      # Pi build disabled: QEMU emulation crashes on Node.js packages
-      # - name: Build cryodev-pi
-      #   run: nix build .#nixosConfigurations.cryodev-pi.config.system.build.toplevel --impure
+      - name: Build cryodev-pi
+        run: nix build .#nixosConfigurations.cryodev-pi.config.system.build.toplevel --impure --extra-platforms aarch64-linux

.forgejo/workflows/deploy.yml

@@ -25,19 +25,82 @@ jobs:
       - name: Build cryodev-main
         run: nix build .#nixosConfigurations.cryodev-main.config.system.build.toplevel --impure
 
-      # Pi build disabled: QEMU emulation crashes on Node.js packages
-      # - name: Build cryodev-pi
-      #   run: nix build .#nixosConfigurations.cryodev-pi.config.system.build.toplevel --impure
+      - name: Build cryodev-pi
+        run: nix build .#nixosConfigurations.cryodev-pi.config.system.build.toplevel --impure --extra-platforms aarch64-linux
 
-  # Pi builds require native aarch64 or reliable QEMU emulation.
-  # Currently disabled due to QEMU crashes with Node.js packages.
-  # Build Pi images locally with:
-  #   nix build .#nixosConfigurations.cryodev-pi.config.system.build.sdImage --extra-platforms aarch64-linux
-  #
-  # build-pi-images:
-  #   needs: build-hosts
-  #   ...
-  #
-  # create-release:
-  #   needs: build-pi-images
-  #   ...
+  build-pi-images:
+    needs: build-hosts
+    runs-on: host
+    strategy:
+      matrix:
+        host: [cryodev-pi]
+      fail-fast: false
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Build SD image for ${{ matrix.host }}
+        run: |
+          echo "Building SD image for: ${{ matrix.host }}"
+          nix build .#nixosConfigurations.${{ matrix.host }}.config.system.build.sdImage \
+            --extra-platforms aarch64-linux \
+            --out-link result-${{ matrix.host }}
+
+          IMAGE_PATH=$(find result-${{ matrix.host }} -name "*.img.zst" -type f | head -1)
+          if [ -z "$IMAGE_PATH" ]; then
+            echo "Error: No image found!"
+            exit 1
+          fi
+
+          cp "$IMAGE_PATH" ./${{ matrix.host }}-sd-image.img.zst
+          sha256sum ${{ matrix.host }}-sd-image.img.zst > ${{ matrix.host }}-sd-image.img.zst.sha256
+
+          echo "Image size:"
+          ls -lh ${{ matrix.host }}-sd-image.img.zst
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: ${{ matrix.host }}-sd-image
+          path: |
+            ${{ matrix.host }}-sd-image.img.zst
+            ${{ matrix.host }}-sd-image.img.zst.sha256
+
+  create-release:
+    needs: build-pi-images
+    runs-on: host
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Download all artifacts
+        uses: actions/download-artifact@v3
+        with:
+          path: artifacts/
+
+      - name: Create Release and Upload
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          VERSION="v$(date +%Y-%m-%d)-$(git rev-parse --short HEAD)"
+
+          curl -s -X POST \
+            -H "Authorization: token ${GITHUB_TOKEN}" \
+            -H "Content-Type: application/json" \
+            -d "{\"tag_name\": \"${VERSION}\", \"name\": \"Pi Images ${VERSION}\", \"body\": \"Raspberry Pi SD card images. See docs for usage.\", \"draft\": false, \"prerelease\": false}" \
+            "https://git.cryodev.xyz/api/v1/repos/${GITHUB_REPOSITORY}/releases" \
+            -o release.json
+
+          RELEASE_ID=$(jq -r '.id' release.json)
+          echo "Release ID: $RELEASE_ID"
+
+          for file in $(find artifacts -type f); do
+            echo "Uploading: $(basename $file)"
+            curl -s -X POST \
+              -H "Authorization: token ${GITHUB_TOKEN}" \
+              -H "Content-Type: application/octet-stream" \
+              --data-binary @"$file" \
+              "https://git.cryodev.xyz/api/v1/repos/${GITHUB_REPOSITORY}/releases/${RELEASE_ID}/assets?name=$(basename $file)"
+          done
+
+          echo "Done: https://git.cryodev.xyz/${GITHUB_REPOSITORY}/releases/tag/${VERSION}"