Initial infrastructure setup: Gitea + PostgreSQL + Actions Runner

.env.example

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+# Gitea Infrastructure Environment Variables
+# Copy to .env and fill in values
+
+# Domain
+GITEA_DOMAIN=git.infra.donovankelly.xyz
+
+# PostgreSQL
+POSTGRES_USER=gitea
+POSTGRES_PASSWORD=CHANGE_ME_generate_with_openssl_rand_hex_16
+POSTGRES_DB=gitea
+
+# Gitea Secrets (preserve from old instance's app.ini)
+INTERNAL_TOKEN=
+LFS_JWT_SECRET=
+OAUTH2_JWT_SECRET=
+SECRET_KEY=
+
+# Gitea Actions Runner
+# Generate after Gitea is running:
+#   docker exec gitea gitea actions generate-runner-token
+RUNNER_REGISTRATION_TOKEN=REPLACE_ME_AFTER_FIRST_DEPLOY