Work around current SSL issue by including LE's certs

Due to a misconfiguration, there is currently an SSL error while attempting
to get the keyring from dlang.org.
To work around it, we can simply include the intermediate certificate for dlang.org,
which the website should serve but doesn't.

.github/workflows/test.yml

@@ -31,6 +31,10 @@ jobs:
     steps:
       - uses: actions/checkout@master
 
+      # Pre steps don't run when using local actions
+      - name: Run pre step
+        run: node lib/export_certs.js
+
       - name: Install D compiler
         uses: ./
         with:

action.yml

@@ -11,4 +11,5 @@ inputs:
     required: false
 runs:
   using: "node12"
+  pre:  "lib/export_certs.js"
   main: "lib/main.js"

cert/lets_encrypt_intermediate.pem

@@ -0,0 +1,183 @@
+Let's Encrypt Authority X1
+Digital Signature Trust Co.
+009813F47513E5750B43E7431E971E44BD
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+
+Let's Encrypt Authority X2
+Digital Signature Trust Co.
+00C3834C98C0BD6B252CA379B66FA52B0E
+-----BEGIN CERTIFICATE-----
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+
+Let's Encrypt Authority X3
+Digital Signature Trust Co.
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+-----BEGIN CERTIFICATE-----
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+
+Let's Encrypt Authority X4
+Digital Signature Trust Co.
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+
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lib/export_certs.js

@@ -0,0 +1,8 @@
+// Quick and dirty script to export NODE_EXTRA_CA_CERTS
+// It cannot be used after startup: https://github.com/nodejs/node/issues/20434
+const fs = require('fs');
+const path = require('path');
+const process = require('process');
+// First arg is a file name, hence the double ".."
+fs.appendFileSync(process.env.GITHUB_ENV, "NODE_EXTRA_CA_CERTS=" +
+                  path.resolve(process.argv[1], "../../cert/lets_encrypt_intermediate.pem") + "\n");

package.json

@@ -1,6 +1,6 @@
 {
   "name": "setup-dlang",
-  "version": "1.0.1",
+  "version": "1.0.4",
   "private": false,
   "description": "Installation of the requested D compiler",
   "main": "lib/main.js",