ci: Setup font used in comparison sample in workflow

.github/workflows/fontship.yml

@@ -16,6 +16,8 @@ jobs:
       - name: Fetch tags
         run: |
           git fetch --prune --tags ||:
+      - name: Setup prerequisites
+        run: sudo apt-get -qq install fonts-texgyre
       - name: Fontship make
         uses: theleagueof/fontship@v0
         # Work around fontship v0.10.0 an below trying to force install-dist on first pass
@@ -28,9 +30,11 @@ jobs:
           args: documentation/waterfalls.sil
       - name: SILE
         id: sile
-        uses: sile-typesetter/sile@v0
-        with:
-          args: documentation/sample.sil
+        run: |
+          docker run -t -v "/usr/share/texmf/fonts/opentype/public/tex-gyre/:/fonts" ghcr.io/sile-typesetter/sile:v0 -- documentation/sample.sil
+        # uses: sile-typesetter/sile@v0
+        # with:
+        #   args: documentation/sample.sil
       - name: Fontship package
         id: fontship
         uses: theleagueof/fontship@v0

fontship.mk

@@ -28,13 +28,20 @@ $$(BUILDDIR)/$1-%-instance.otf: $$(BUILDDIR)/$1-%-normalized.sfd $(GSUB) $(BUILD
 
 endef
 
+depend_font = fc-match "$1" family | $(GREP) -qx "$1"
+
+.PHONY: tex-gyre-fonts
+tex-gyre-fonts:
+	$(CONTAINERIZED) && pacman --noconfirm --needed -Sq $@ ||:
+	$(call depend_font,TeX Gyre Termes)
+
 define POSTFONTSHIPEVAL =
 
 $$(DOCSDIR)/preview.pdf: $$(DOCSDIR)/preview.tex | $$(STATICOTFS) $$(BUILDDIR)
 	xelatex --interaction=batchmode -output-directory=$$(BUILDDIR) $$<
 	cp $(BUILDDIR)/$$(@F) $$@
 
-$$(DOCSDIR)/sample.pdf: $$(DOCSDIR)/sample.sil $$(STATICOTFS)
+$$(DOCSDIR)/sample.pdf: $$(DOCSDIR)/sample.sil $$(STATICOTFS) tex-gyre-fonts
 	sile -o $$@ -d versions $$<
 
 $$(DOCSDIR)/waterfalls.pdf: $$(DOCSDIR)/waterfalls.sil $$(STATICOTFS)