ci: use TinyGo version in artifact files

This avoids needing to rename them ourselves (which is kinda annoying)
and also avoids mistakes in the process.

.github/workflows/linux.yml

@@ -20,6 +20,18 @@ jobs:
     container:
       image: golang:1.23-alpine
     steps:
+      - name: Get TinyGo version
+        id: version
+        run: ./.github/workflows/tinygo-extract-version.sh
+      - name: TEST use version ${{ steps.version.outputs.version }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: linux-amd64-${{ steps.version.outputs.version }}-double-zipped
+          path: |
+            /tmp/tinygo${{ steps.version.outputs.version }}.linux-amd64.tar.gz
+            /tmp/tinygo_${{ steps.version.outputs.version }}_amd64.deb
+      - name: exit
+        run: program-does-not-exist
       - name: Install apk dependencies
         # tar: needed for actions/cache@v4
         # git+openssh: needed for checkout (I think?)

.github/workflows/tinygo-extract-version.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+# Extract the version string from the source code, to be stored in a variable.
+grep 'const version' goenv/version.go | sed 's/^const version = "\(.*\)"$/version=\1/g'