ci: add Swarm upload workflow

.github/workflows/swarm-upload.yaml

@@ -0,0 +1,67 @@
+name: Swarm Upload
+
+on:
+  push:
+    branches:
+      - 'master'
+
+jobs:
+  deploy:
+    # GitHub-hosted is sufficient: the bee endpoint is publicly reachable and
+    # gated by PRIVATE_API_TOKEN, so this does not need the self-hosted runners
+    # (and a public repo should not be granted access to them).
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-node@v6
+        with:
+          node-version: '24'
+          # No-op for caching here (package.json declares no packageManager /
+          # devEngines field), but it also skips setup-node's `npm --version`
+          # probe, which is known to hang on the self-hosted runners if this
+          # job is ever moved there.
+          package-manager-cache: false
+
+      - name: Build
+        run: |
+          npm ci
+          npm run build
+
+      - name: Upload to Swarm
+        uses: ethersphere/swarm-actions/upload-dir@latest
+        id: upload
+        with:
+          dir: ./build
+          index-document: index.html
+          postage-batch-id: ${{ secrets.PRIVATE_POSTAGE_BATCH_ID }}
+          bee-url: ${{ secrets.PRIVATE_BEE_URL }}
+          timeout: 300000
+          deferred: false
+          headers: |
+            authorization: ${{ secrets.PRIVATE_API_TOKEN }}
+
+      - name: Setup feed
+        uses: ethersphere/swarm-actions/write-feed@latest
+        id: feed
+        with:
+          reference: ${{ steps.upload.outputs.reference }}
+          topic: "swarm-docs"
+          postage-batch-id: ${{ secrets.PRIVATE_POSTAGE_BATCH_ID }}
+          bee-url: ${{ secrets.PRIVATE_BEE_URL }}
+          signer: ${{ secrets.PRIVATE_SIGNER }}
+          headers: |
+            authorization: ${{ secrets.PRIVATE_API_TOKEN }}
+
+      - uses: ethersphere/swarm-actions/reference-to-cid@v0
+        id: cid
+        with:
+          reference: ${{ steps.feed.outputs.manifest }}
+
+      - run: |
+          echo 'Chunk Reference: ${{ steps.upload.outputs.reference }}'
+          echo 'Feed Reference: ${{ steps.feed.outputs.reference }}'
+          echo 'Feed Manifest: ${{ steps.feed.outputs.manifest }}'
+          echo 'Feed Bzz.link: https://${{ steps.cid.outputs.cid }}.bzz.link'

scripts/fetch-awesome-swarm.mjs

@@ -5,12 +5,12 @@ import { mkdir, writeFile } from 'node:fs/promises';
 import { resolve, dirname } from 'node:path';
 
 const SOURCE_URL =
-  'https://raw.githubusercontent.com/ethersphere/awesome-swarm/refs/heads/master/README.md';
+  'https://raw.githubusercontent.com/ethersphere/awesome-swarm/refs/heads/main/README.md';
 
 const OUT_PATH = resolve(process.cwd(), 'docs/references/awesome-list.mdx');
 
-const REPO_HTTP_BASE = 'https://github.com/ethersphere/awesome-swarm/blob/master/';
-const RAW_HTTP_BASE  = 'https://raw.githubusercontent.com/ethersphere/awesome-swarm/master/';
+const REPO_HTTP_BASE = 'https://github.com/ethersphere/awesome-swarm/blob/main/';
+const RAW_HTTP_BASE  = 'https://raw.githubusercontent.com/ethersphere/awesome-swarm/main/';
 
 function normalizeNewlines(str) {
   return str.replace(/\r\n/g, '\n');
@@ -30,6 +30,30 @@ function rewriteRelativeLinks(md) {
   return md;
 }
 
+// MDX (Docusaurus) requires void HTML elements to be self-closed. The upstream
+// README embeds a raw <img> inside an <a>; left as-is the build fails with
+// "end-tag-mismatch".
+function selfCloseVoidTags(md) {
+  return md.replace(
+    /<(img|br|hr|input|meta|source)\b([^>]*?)\s*\/?>/gi,
+    (_m, tag, attrs) => `<${tag}${attrs.replace(/\s+$/, '')} />`
+  );
+}
+
+// Relative paths inside raw HTML attributes are not covered by the markdown
+// link rewriting above, so they would 404 once rendered on the docs site.
+function rewriteHtmlAssetPaths(md) {
+  md = md.replace(
+    /(<[^>]*\ssrc=")(?!https?:|data:|#|\/)([^"]+)(")/gi,
+    (_m, pre, path, post) => `${pre}${RAW_HTTP_BASE}${path}${post}`
+  );
+  md = md.replace(
+    /(<[^>]*\shref=")(?!https?:|mailto:|#|\/)([^"]+)(")/gi,
+    (_m, pre, path, post) => `${pre}${REPO_HTTP_BASE}${path}${post}`
+  );
+  return md;
+}
+
 async function main() {
   const res = await fetch(SOURCE_URL);
   if (!res.ok) throw new Error(`Fetch failed: ${res.status} ${res.statusText}`);
@@ -39,7 +63,7 @@ async function main() {
   // Optional: strip upstream H1 to avoid a second big title under our frontmatter title
   md = md.replace(/^# .*\n+/, '');
 
-  md = rewriteRelativeLinks(md);
+  md = selfCloseVoidTags(rewriteHtmlAssetPaths(rewriteRelativeLinks(md)));
 
   const header = `---
 title: Awesome Swarm