tlmgrをキャッシュするようにした

.github/workflows/ci.yml

@@ -60,6 +60,24 @@ jobs:
           username: ${{ github.repository_owner }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: tlmgr-pkgs Cache
+        uses: actions/cache@v4
+        id: cache
+        with:
+          path: |
+            tlmgr-pkgs
+          key: cache-${{ hashFiles('Dockerfile') }}-${{ env.PLATFORM_PAIR }}
+
+      - name: inject cache into docker
+        # v3.1.2のcommitを指定
+        uses: reproducible-containers/buildkit-cache-dance@5b6db76d1da5c8b307d5d2e0706d266521b710de
+        with:
+          cache-map: |
+            {
+              "tlmgr-pkgs": "/tlmgr-pkgs"
+            }
+          skip-extraction: ${{ steps.cache.outputs.cache-hit }}
+
       - name: Build and push by digest
         id: build
         uses: docker/build-push-action@v6

Dockerfile

@@ -65,14 +65,19 @@ RUN echo "Set PATH to $PATH" && \
 # tlmgr section
 RUN tlmgr update --self
 
+# cacheされたディレクトリはイメージに焼き付けられないため、最終生成物はキャッシュ外にコピーする
 # package install
-RUN tlmgr install --no-persistent-downloads \
+RUN --mount=type=cache,target=/tlmgr-pkgs,sharing=locked \
+    tlmgr restore --force --backupdir /tlmgr-pkgs --all || true && \
+    tlmgr install --no-persistent-downloads \
       latexmk collection-luatex collection-langjapanese \
       collection-fontsrecommended type1cm mdframed needspace newtx \
       fontaxes boondox everyhook svn-prov framed subfiles titlesec \
       tocdata xpatch etoolbox l3packages \
       biblatex pbibtex-base logreq biber import environ trimspaces tcolorbox \
       ebgaramond algorithms algorithmicx xstring siunitx bussproofs enumitem && \
+    tlmgr backup --clean --backupdir /tlmgr-pkgs --all && \
+    tlmgr backup --backupdir /tlmgr-pkgs --all && \
     tlmgr path add
 
 # EBGaramond