Use official Sphinx image (#822)

Author: calmh

.github/workflows/build.yml

@@ -17,8 +17,13 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Set release/tag
+        run: |
+          git describe --tags --long --always > RELEASE || true
+          git describe --tags --exact-match > TAG || true
+
       - name: Build
-        uses: docker://ghcr.io/kastelo/sphinx-build
+        uses: docker://docker.io/sphinxdoc/sphinx-latexpdf:latest
         with:
           entrypoint: make
           args: html man latexpdf

.gitignore

@@ -2,3 +2,5 @@ _build/
 _deployed
 _deployed.old
 _syncthing
+/RELEASE
+/TAG

conf.py

@@ -62,12 +62,19 @@
 # built documents.
 #
 # The full version, including alpha/beta/rc tags.
+
+release = 'v1'
 try:
+    release = open('RELEASE', 'r').read().strip()
+except FileNotFoundError:
     release = os.popen('git describe --tags --long --always').read().strip()
+
+_git_tag = ''
+try:
+    _git_tag = open('TAG', 'r').read().strip()
+except FileNotFoundError:
     _git_tag = os.popen('git describe --tags --exact-match').read().strip()
-except Exception:
-    release = 'v1'
-    _git_tag = ''
+
 # The short X.Y version.
 version = release.partition('-')[0]
 

docker-build.sh

@@ -1,9 +1,12 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+git describe --tags --long --always > RELEASE || true
+git describe --tags --exact-match > TAG || true
+
 target="${1:-html}"
 docker run --rm \
   -v "$(pwd):$(pwd)" \
   -w "$(pwd)" \
-  ghcr.io/kastelo/sphinx-build:latest \
+  docker.io/sphinxdoc/sphinx-latexpdf:latest \
   make "$target"