gitea workflow: push to IPCR's direct host (Cloudflare 100 MB cap)

.gitea/workflows/docker-publish.yml

@@ -2,9 +2,14 @@
 # folder exists, and GitHub never reads it.
 #
 # Publishes to IPCR on watch.nsl.sh instead of ghcr.io:
-#   push  ipcr-push-watch.nsl.sh/metadec.eth/<repo>:<tag>   docker login as metadec.eth with the
+#   push  ipcr-push-85-17-246-67.nip.io/metadec.eth/<repo>:<tag>   docker login as metadec.eth with the
 #         IPCR_PUSH_TOKEN secret (the metadec.eth namespace token from the IPCR dashboard)
 #   pull  ipcr-watch.nsl.sh/ipns/metadec.eth/metadec.eth/<repo>:<tag>   anonymous
+# The push goes to ipcr-push-85-17-246-67.nip.io, the box's own address, not ipcr-push-watch.nsl.sh: Cloudflare fronts
+# *.watch.nsl.sh and refuses any request over 100 MB (413), which a large image layer is.
+# That host's certificate is signed by the box's private Mesh Router CA, given to buildkit from
+# the IPCR_CA_PEM repo variable. docker login would make the job's Docker daemon check the
+# certificate without that CA, so the login is written straight into ~/.docker/config.json.
 # The runner's job image (node:22-bookworm) has no docker CLI, so the static one is
 # installed first; buildx installs itself. No `type=gha` cache: the runner has none.
 
@@ -29,7 +34,7 @@ on:
         default: 'latest'
 
 env:
-  REGISTRY: ipcr-push-watch.nsl.sh
+  REGISTRY: ipcr-push-85-17-246-67.nip.io
   IPCR_PULL: ipcr-watch.nsl.sh/ipns/metadec.eth
   IMAGE_NAME: metadec.eth/${{ github.event.repository.name }}
 
@@ -47,17 +52,25 @@ jobs:
       - name: Install Docker CLI
         run: curl -fsSL https://download.docker.com/linux/static/stable/x86_64/docker-28.5.1.tgz | tar -xz -C /usr/local/bin --strip-components=1 docker/docker
 
+      - name: Trust the Mesh Router CA
+        run: printf '%s\n' "$IPCR_CA_PEM" > /tmp/ipcr-ca.pem
+        env:
+          IPCR_CA_PEM: ${{ vars.IPCR_CA_PEM }}
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
         with:
           version: latest
+          buildkitd-config-inline: |
+            [registry."${{ env.REGISTRY }}"]
+              ca = ["/tmp/ipcr-ca.pem"]
 
       - name: Log in to IPCR
-        uses: docker/login-action@v3
-        with:
-          registry: ${{ env.REGISTRY }}
-          username: metadec.eth
-          password: ${{ secrets.IPCR_PUSH_TOKEN }}
+        env:
+          IPCR_PUSH_TOKEN: ${{ secrets.IPCR_PUSH_TOKEN }}
+        run: |
+          mkdir -p ~/.docker
+          printf '{"auths":{"%s":{"auth":"%s"}}}\n' "$REGISTRY" "$(printf 'metadec.eth:%s' "$IPCR_PUSH_TOKEN" | base64 -w0)" > ~/.docker/config.json
 
       - name: Extract metadata (tags, labels)
         id: meta