CI: harden the cache.yml graphviz step too; two attempts with wider per-attempt timeouts (4m/14m)

Addresses Copilot review on QuantEcon/lecture-python.zh-cn#263: the cache.yml graphviz step was missed by a name match, and three 3m/9m attempts could never let a slow-but-progressing install finish. Now two attempts at 4m (graphviz) / 14m (texlive) inside the unchanged 10/30-minute step budgets.

Author: mmcky

.github/workflows/ci.yml

@@ -41,9 +41,9 @@ jobs:
           # Retried with a per-attempt timeout: a stalled Ubuntu mirror otherwise
           # hangs this step for hours (two 358-minute hangs on 2026-08-18).
           pkgs="texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended texlive-fonts-extra texlive-xetex latexmk xindy dvipng cm-super"
-          for attempt in 1 2 3; do
-            timeout 9m sudo bash -c "apt-get -qq update && apt-get install -y $pkgs" && break
-            if [ "$attempt" = 3 ]; then echo "apt-get failed after 3 attempts"; exit 1; fi
+          for attempt in 1 2; do
+            timeout 14m sudo bash -c "apt-get -qq update && apt-get install -y $pkgs" && break
+            if [ "$attempt" = 2 ]; then echo "apt-get failed after 2 attempts"; exit 1; fi
             echo "apt-get attempt $attempt failed; retrying in 30s"; sleep 30
           done
       - name: Display Conda Environment Versions

.github/workflows/publish.yml

@@ -57,9 +57,9 @@ jobs:
           # Retried with a per-attempt timeout: a stalled Ubuntu mirror otherwise
           # hangs this step for hours (two 358-minute hangs on 2026-08-18).
           pkgs="texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended texlive-fonts-extra texlive-xetex latexmk xindy dvipng cm-super"
-          for attempt in 1 2 3; do
-            timeout 9m sudo bash -c "apt-get -qq update && apt-get install -y $pkgs" && break
-            if [ "$attempt" = 3 ]; then echo "apt-get failed after 3 attempts"; exit 1; fi
+          for attempt in 1 2; do
+            timeout 14m sudo bash -c "apt-get -qq update && apt-get install -y $pkgs" && break
+            if [ "$attempt" = 2 ]; then echo "apt-get failed after 2 attempts"; exit 1; fi
             echo "apt-get attempt $attempt failed; retrying in 30s"; sleep 30
           done
       - name: Display Conda Environment Versions