Add Couchbase 2.5 Docker build and publish workflow

Introduces a Dockerfile for Couchbase Server 2.5 on Ubuntu 12.04, a GitHub Actions workflow to build and publish the image to GHCR, and a .gitignore to exclude .deb and .rpm files. Also adds local settings for permissions.

.github/workflows/publish-couchbase-2.5.yml

@@ -0,0 +1,53 @@
+name: Publish Couchbase 2.5 Docker Image
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'couchbase-2.5/**'
+  workflow_dispatch:
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Download Couchbase 2.5.2 RPM
+        run: |
+          cd couchbase-2.5
+          wget https://launchpadlibrarian.net/90920725/libgpg-error0_1.10-2ubuntu1_amd64.deb
+          wget https://launchpadlibrarian.net/462496703/libgcrypt11_1.5.0-3ubuntu0.9_amd64.deb
+          wget https://launchpadlibrarian.net/98077365/libp11-kit0_0.12-2ubuntu1_amd64.deb
+          wget https://launchpadlibrarian.net/329563761/libtasn1-3_2.10-1ubuntu1.6_amd64.deb
+          wget https://launchpadlibrarian.net/311120336/libgnutls26_2.12.14-5ubuntu3.14_amd64.deb
+          wget https://launchpadlibrarian.net/320724516/librtmp0_2.4~20110711.gitc28f1bab-1ubuntu0.1_amd64.deb
+          wget https://packages.couchbase.com/releases/2.5.2/couchbase-server-enterprise_2.5.2_x86_64.deb
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ghcr.io/${{ github.repository }}/couchbase-2.5
+          tags: |
+            type=raw,value=2.5
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v4
+        with:
+          context: couchbase-2.5
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}